Sujet: sphère liste de sujets
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106 articles trouvés pour ce sujet.

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	Volume d'une sphere entre 4 autres spheres		2010-01-18
		Bonfils pose la question : Bonjour, Je souhaiterais en fait calculer le rayon de la sphère max qui pourrait s'insérer entre 4 sphères de rayon connu. Merci par avance pour votre réponse. Sincères salutations Chris Fisher lui répond.
	Une sphere		2007-12-03
		karine pose la question : voici ce que je dois trouver ; j'aiune boule disco mesurant 48'' de diametre je veux savoir combien de petit miroir il y a sur cette boule si les petits miroires on 1'' carré ? Claude Tardif lui répond.
	5 points équidistants sur la surface d' une sphère		2005-08-15
		Jean pose la question : J' aimerais placer 5 points équidistants sur la surface d' une sphère. Si vous aviez une formule simple pour un néophyte, cela m' aiderais beaucoup. Claude Tardif lui répond.
	1 ellipsoïde et une sphère		2005-04-04
		Tihon pose la question : Dans le cadre de mon mémoire réalisé à l'université de Liège (Belgique), je suis amené à savoir si 1 ellipsoïde et une sphère ont ou n'ont pas d'intersection...Quelqu'un peut-il m'aider?? Claude Tardif lui répond.
	Un empilement de spheres		2002-04-16
		Sébastien pose la question : Lorsque j'etais encore a l'universite je me souviens qu'un prof nous avez dit, sans le demontrer (ce n'est pas bien du tout de sa part) que l'espace minimal qui existe dans un empilement de spheres est de l'ordre de 26% Voici plusieurs jours que je cherche a resoudre ce probleme de geometrie, et je n'arrive meme pas a trouver comment l'aborder. Claude Tardif lui répond.
	Le volume d'une sphère		2000-09-17
		Pitmill pose la question : merci de me donner la formule pour trouver le volume d'une sphère. Harley Weston lui répond.
	A hemisphere and a cylinder		2020-03-23
		Monalizsha pose la question : Wat is the volume and the surface area of the hemisphere and cylinder (both are together) The height is 12cm of the cylinder and the diameter is 6cm Penny Nom lui répond.
	Volume and Surface area of a sphere		2019-05-03
		Caitlin pose la question : Why does the surface area formula of a sphere have a squared radius while the volume of a sphere has a cubed radius? Penny Nom lui répond.
	An ice cream cone		2019-02-05
		Eyuel pose la question : a scoop of ice cream has a 3-inch radius how tall should the ice cream cone at the same radius be in order to contain all of the ice creams inside the cone Penny Nom lui répond.
	7 spheres on a hexagonal tray		2019-01-14
		herm pose la question : what is the length of each side of a hexagonal tray, with the height of each side 0.75 inch, to hold seven spheres, each with a diameter of 3.00 inches? The spheres are placed such that each side of the hexagon is touched by one sphere at its midpoint (and the seventh sphere is place in the center of the "ring" of the other six spheres. Harley Weston lui répond.
	The volume o a hemisphere		2018-05-06
		Sambox pose la question : When I have a hemisphere with a volume of 700Pi m^3 what is the radius? Penny Nom lui répond.
	Surface area of a hemisphere		2017-10-28
		Shaina pose la question : If the total surface area of a hemisphere be 36.22/7 cm then its radius will be 3 cm is it true or false Penny Nom lui répond.
	The surface area of a sphere		2017-09-17
		penny pose la question : The surface area of a sphere is 1519.76cm. Taking 3.14 , find the radius of sphere Penny Nom lui répond.
	A cone inscribed in a hemisphere		2016-08-07
		anonymous pose la question : A cone is inscribed in a hemisphere. the slant height of the cone is 20cm. When cut along its slant height, the cone forms a sector of a circle. find the angle of the sector, to the nearest 1 decimal place. Penny Nom lui répond.
	An algebra problem with a sphere		2016-02-29
		Sania pose la question : If the number of square centimeters on the surface area of a sphere is equal to the number of cubic centimeters in its volume find its diameter Penny Nom lui répond.
	The surface area of a hemisphere		2015-05-05
		Mandy pose la question : How can I show that the total surface are of any solid hemisphere is 75% of the area of the full sphere? Penny Nom lui répond.
	The volume of a sphere		2015-04-30
		Cassidy pose la question : How do you find the radius of a sphere that has volume 36pI? Penny Nom lui répond.
	Largest cone in a sphere		2015-01-15
		Alfredo pose la question : What is the altitude of the largest circular cone that may be cut out from a sphere of radius 6 cm? Penny Nom lui répond.
	The volume and radius of a sphere		2014-04-27
		grace pose la question : How do you find the radius of a sphere when all you know is the volume? Penny Nom lui répond.
	A cone inscribed in a sphere		2014-02-28
		joel pose la question : how can I find the radius and the height of a cone INSCRIBED in a sphere, given the sphere having a radius of 6? ( note: the diameter of the cone is equal to its slanted height). Penny Nom lui répond.
	Covering a styrofoam ball with fabric		2013-09-11
		Alice pose la question : I am trying to create a pattern in order to cover a styrofoam ball with fabric. The pattern needs to be done in such a way as to have only a center seam, rather than several vertical lines as in slicing a melon. Chris Fisher lui répond.
	The volume of a sphere		2012-08-18
		Rohit pose la question : why isn't volume of a sphere = Area of a semicircle x the circumference. i.e. if we revolve a semicircle around its axis we get a sphere Penny Nom lui répond.
	Water in a hemispherical bowl		2012-05-12
		Jimmy pose la question : A bowl of water, being a hemisphere has a radius of 36cm. Water is filled in the bowl and has depth of 18 cm. Find the surface area of the water? Penny Nom lui répond.
	A rectangular block and a sphere		2012-02-02
		snehal pose la question : a solid rectangular block of metal 49 cm. by 44cm. 18cm. is melted and formed into a solid sphere, find the radius of the sphere[22/7] Penny Nom lui répond.
	A cube inscribed in a sphere		2012-01-23
		Gelo pose la question : What are the largest volume and total surface area of a cube that may be inscribed inside a sphere whose radius is 5 kilometers. Walter Whiteley lui répond.
	The surface area of a hemisphere		2011-05-29
		Brenda pose la question : What is the surface area of a hemisphere with a radius of 2 inches? Penny Nom lui répond.
	The equation of a sphere		2011-04-16
		kanika pose la question : equation of sphere and how to know its center Penny Nom lui répond.
	A conical container and a spherical balloon		2011-04-06
		Steven pose la question : Water is running out of a conical container 12 feet in diameter and 8 feet deep (vertex down) and filling a spherical balloon. At the instant the depth of the water in the cone is 4 feet, the radius of the sphere is approximately 4 feet. The rate of change of the depth of the water in the cone at the instant is approximately ______________ times the rate of change of the radius of the balloon. Penny Nom lui répond.
	The equation of a sphere		2011-02-09
		kelly pose la question : what is the equation of a sphere if one of it's diameters has a giving end point of (4,4,4), (8,8,8)? Penny Nom lui répond.
	Packing spheres in a given region		2010-01-27
		MISAEL pose la question : IN A VOLUME GENERATED BY TWO TRAPEZOIDS WITH DIFFERENT SURFACE AREAS BUT SHARING THE BOTTOM PLANE: HOW CAN I CALCULATE THE "N" SPHERES WHICH THIS VOLUME CAN CONTAIN? HOW CAN I CALCULATE THE VOLUME OF SPACES IN RELATIONSHIP WITH VOLUME OF SPHERES OR THE TOTAL VOLUME? Robert Dawson lui répond.
	A cone circumscribed about a given hemisphere		2010-01-19
		Neven pose la question : The cone of smallest possible volume is circumscribed about a given hemisphere. What is the ratio of its height to the diameter of its base? (G.F.Simmons, Calculus with Analytic Geometry, CH4 Applications of Derivatives) Chris Fisher lui répond.
	A triangle on a sphere		2009-09-07
		Rohit pose la question : How do I find the angles of a triangle drawn on a sphere (spherical triangle)? Chris Fisher lui répond.
	Maximum Volume of a Cylinder Inscribed in a Sphere		2009-06-18
		Jim pose la question : Hello I have a hard time finishing this question: A right circular cylinder has to be designed to sit inside a sphere of radius 6 meters so that each top and bottom of the cylinder touches the sphere along its complete circular edge. What are the dimensions of the cylinder of max volume and what is the volume? Janice Cotcher lui répond.
	A large, hollow, ice cream cone		2009-04-03
		Darah pose la question : A manufacturer is making a large, hollow, ice cream cone to serve as an ad for a local Baskin-Robbins. The ice cream cone is made up of a cone with height 8 feet, topped by a hemi-sphere with radius 6 feet. How much ice cream could the hollow object hold? If a gallon is 0.13368 cubic feet, how many gallons does it hold? If 3 gallons of Baskin-Robbins heavy cream chocolate blend weighs 24 pounds, how much would the ice cream cone weigh, excluding the weight of the construction material? Stephen La Rocque lui répond.
	The rate of change of the volume of a sphere		2009-03-25
		Kaylin pose la question : why the rate of change of volume of a sphere is not constant even though dr/dt is constant? Walter Whiteley lui répond.
	How many ball bearings can you make from a cone?		2009-03-14
		Vatsal pose la question : there is a sum in my maths book which states the following: how many ball bearings of diameter 2.5 cm. can you get by melting a solid metalic cone of radi. 20cm and a Hight of 5 meters? how do i do this please tell me even the minute things like cancellatoins and where to use = , ; or any such thing because Im a bit weak in maths Harley Weston lui répond.
	The floor area in a spherical space station		2009-02-14
		Ed pose la question : I am writing a science fiction novel that involves a spherical space station with a radius of 800 meters. Inside, artificial gravity allows parallel floors set 4 meters apart. If you count the floor that has a radius of 800 meters as Floor 0, then the next floor up (Floor +1) would by 4 meters above the surface of Floor 0. There would then be Floor -1 4 meters down from Floor 0. This would continue until you reach the top or bottom floor, where there is at least 4 meters but less than 8 meters to the top or bottom of the sphere. Obviously the top and bottom floors would have the (same) smallest area, while Floor 0 would have about 2 million square feet. My problem is figuring out the total area of all of the floors, or for that matter, any particular floors or the total number of floors (the total of all the + floors, the - floors (these numbers will be the same) plus Floor 0. Ed Penny Nom lui répond.
	Solid figures		2009-02-10
		Rebecca pose la question : I need to know the names of solid figures. I have several pictures that I need to answer what type they are. Thanks, Rebecca 3rd grade Penny Nom lui répond.
	A sphere in a cone		2009-02-10
		Shubham pose la question : An upturned conical vessel of radius 6cm and height 8cm is completely filled with water. A sphere is lowered in the conical vessel filled with water and the size of sphere is such that it just touches the sides of cone and is just immersed. What fraction of water overflows? Harley Weston lui répond.
	Segments of a sphere		2009-01-16
		Herman pose la question : How do I solve for a segment of a sphere so that the orange peel or pie shaped section is converted to a flat surface with dimensions. I form large diameter domes, elliptical and sphere heads on a press. I enter the diameter say 30 feet with two segments above and below the equator and the total number of segment around the circumference at say 18 so the widest part of the pie shaped section will fit my press. How do I take the upper or lower course above or below the equator and figure the height of the orange peel shape, the chord length at top and bottom, and solve for the right angle at 2 degree increments down the arc length of the pieces so I can layout the flat plates prior to pressing. Thanks for your help. Robert Dawson lui répond.
	The volume and surface area of a sphere		2009-01-07
		destini pose la question : the volume of a sphere is equal to its surface area. what is its radius Chris Fisher lui répond.
	A sphere in a can of water		2008-12-12
		Meghan pose la question : A cylindrical can open at the top has (inside) base radius equal to 1. The height of the can is greater than 2. Imagine placing a steel sphere of radius less than 1 into the can, then pouring water into the can until the top of the sphere is just covered. What should be the radius of the sphere so the volume of water used is as large as possible? Harley Weston lui répond.
	The volume is decreased by 25%		2008-11-17
		Wanda pose la question : If the volume of a sphere is decreased by 25%, what is the new equation? Penny Nom lui répond.
	Melting ice on a hemisphere		2008-10-20
		heather pose la question : The top of a silo is the shape of a hemishere of diameter 20 ft. if it is coated uniformly with a layer of ice, and if the thickness is decreasing at a rate of 1/4 in/hr, how fast is the volume of ice changing when the ice is 2 inches thick? Penny Nom lui répond.
	A sphere and hexagons		2008-10-19
		Angela pose la question : A sphere is made of 112 hexagons. Each side measures 10 cm. The width of the border between each hexagon is 5 cm. What is the radius of the sphere? Chris Fisher and Walter Whiteley lui répond.
	The biggest right circular cone that can be inscribed in a sphere		2008-09-08
		astrogirl pose la question : find the volume of the biggest right circular cone that can be inscribed in a sphere of radius a=3 Harley Weston lui répond.
	The diameter of a sphere		2008-06-15
		Scott pose la question : The volume of a sphere is 6000cm cubed. What is the diameter of the sphere? Penny Nom lui répond.
	The radius of a sphere if you know the volume		2008-06-11
		Cey pose la question : how to i find the radius of a sphere with a volume of 1000cm cubed using the formula v=4/3 pi r squared???????/ Penny Nom lui répond.
	A hemisphere and a cylinder		2008-05-18
		Libby pose la question : A giant scoop, operated by a crane, is in the shape of a hemisphere of radius 24 inches. The scoop is filled with molten steel. The steel is then poured into a cylindrical storage tank with diameter 32 inches. How high will the molten steel rise? I got the volume of the hemisphere and the volume of the cylinder, but I'm not exactly sure what to do next. Penny Nom lui répond.
	A net for a hemisphere		2008-05-06
		Julie pose la question : how would you draw the net of a hemisphere? Walter Whiteley lui répond.
	The isoperimetric inequality		2008-04-21
		Dutch pose la question : I'm searching for the proof that the sphere has the smallest volume of any figure and maximizes the volume of any figure. Chris Fisher lui répond.
	The height of a hemisphere		2008-03-25
		Rebekah pose la question : what is the height of a hemisphere with a volume of 60 ft cubed? Stephen La Rocque lui répond.
	The surface area of a hemisphere		2008-01-14
		Nicholas pose la question : the surface area of a hemisphere is 1062 cm2. What is the radius? Penny Nom lui répond.
	Smallest cone containing a 4cm radius inscribed sphere		2007-12-19
		Eva pose la question : A sphere with a radius of 4cm is inscribed into a cone. Find the minimum volume of the cone. Stephen La Rocque lui répond.
	Ball bearings in an oil can		2007-12-03
		Lisa pose la question : One hundred ball bearings with radius 5 mm are dropped into a cylindrical can, which is half full of oil. The height of the cylinder is 20 cm and the radius is 8 cm. By how much does the level of the oil rise? Stephen La Rocque lui répond.
	Dividing the surface of a sphere		2007-09-30
		Jaroslaw pose la question : Is there a formula or method to divide the surface area of a sphere into equal parts. For example; 36 equal parts, 60 equal parts or 92 equal parts and so forth. Chris Fisher and Stephen La Rocque lui répond.
	Size of a sphere fitting inside a cone		2007-09-27
		Juan pose la question : I am supposed to find the largest sphere that will fit into a cone. I am assuming is a maximizing problem, but I am not sure of what relation (between a cone and a sphere) to use. Penny Nom and Stephen La Rocque lui répond.
	A geodesic dome		2007-09-25
		Roger pose la question : In my Science-Fiction series, I have a Dyson's Sphere tiled with regular hexagons. The number of hexagons is over 300,000 and the radius of the Sphere is roughly 80,000,000 miles. The actual size of the Sphere and hexagons have been left flexible until I can come up with a definite number of hexagons that would fit. My problem is the pattern of hexagons which would fit within the sphere without leaving gaps or overlapping. My best guess has been to use four equilateral triangles composed of 78606 hexagons, (396 per edge) arranged around the sphere with six 'zippers' to connect them and four 'caps' at the points, for a total of 316804 hexagons. Given the fact that each Hex is the same size, does this seem plausible? Is there some pattern formula I can use to play with these figures? Simple divsion of areas will not work if the number derived will not fit into the pattern to leave a perfectly tiled surface. Thank you. Chris Fisher lui répond.
	A cube in a sphere		2007-09-11
		Justin pose la question : What percent of the volume of a cube is occupied by the largest possible sphere centered in that cube? Stephen la Rocque lui répond.
	The equation of a sphere		2007-08-11
		isvarya pose la question : Find equation of the sphere with centre (1,-4, 3) and radius 5 What is the intersection of this sphere with the xz plane? Harley Weston lui répond.
	Volume of a brewer's sphere		2007-06-04
		Edward pose la question : A Brewer's Sphere that has a 9' Dia. Holds how much Brew? How many 40oz bottles will be needed to hold his batch of Brew? Stephen La Rocque lui répond.
	A cylinder inside a sphere		2007-04-25
		Louise pose la question : i need to find the maximum volume of a cylinder that can fit inside a sphere of diamter 16cm Penny Nom lui répond.
	Surface area of a sphere		2007-04-08
		maria pose la question : I've read your solution to the problem of how to derive the formula of the surface area of the sphere. But i've got a question that initially you demenstrate the area is apprximately equal to that of the lateral area of the cylinder. Afterwards you simply say that the two areas are exactly equal. I'm very confused, how you connect your two statements together. Can you explain to me how they are exactly equal? Your quick reply would be appreciated. Thanks for your help! Stephen La Rocque lui répond.
	The volume of a hemisphere		2007-03-21
		Sarah pose la question : How do you calculate the volume of a hemisphere? Thanks. Penny Nom lui répond.
	The Geosphere at the the Epcot Center park		2007-03-16
		stephanie pose la question : The epcot center has a diameter of 265 ft the park needs to paint the park one can will cover 400 sq ft how many cans do they need ? Stephen La Rocque lui répond.
	Cut a given sphere by a plane		2007-03-14
		Rory pose la question : Cut a given sphere by a plane so that the volumes of the two segments formed shall be in a given ratio. Show that in modern notation, this leads to the cubic equation m(r+x)^2(2r-x)=n(r-x)^2(2r+x) where r is the radius of the sphere, x is the distance of the cutting plane from the centre of the sphere, and m/n < 1 is the given ratio. Can you help me show the solution to this question. Thank you. Penny Nom lui répond.
	The surface area of a dome		2007-02-11
		chris pose la question : I need to figure the surface area of a dome which is 96" across and 48" tall. Could you help please? Thanks! Penny Nom and Melanie Tyrer lui répond.
	The volume of a sphere		2007-01-16
		Anshul pose la question : How to prove or find the volume of sphere? Harley Weston lui répond.
	The radius of a hemisphere		2006-11-29
		Emma pose la question : how do you calculate the radius of a hemisphere when you are given the volume? Stephen La Rocque lui répond.
	A spherical bowl		2006-11-26
		Lynne pose la question : A spherical bowl of internal radius 15cm is partly filled with liquid. If the radius of the horizontal liquid surface is 12cm, calculate (taking the value of pi to be 3.142), the height of this liquid surface above the center of the bowl. Penny Nom lui répond.
	A sphere in a cube		2006-11-09
		Lukas pose la question : Given a cube and a cross diagonal, what is the largest size sphere that fits in the cube and does not touch or intersect the cross diagonal? Steve La Rocque, Penny Nom and Walter Whiteley lui répond.
	The lower half of a sphere		2006-08-30
		Yvette pose la question : I am interested in finding out how to represent the lower half of a sphere in the form of z=f(x,y) with r=2 and a centre point (3,1). Stephen La Rocque and Penny Nom lui répond.
	A cube inscribed in a sphere		2006-08-03
		Glenn pose la question : Given the diameter of the sphere 10cm. find the largest cube inscribe in the sphere. Stephen La Rocque lui répond.
	What is the radius of the sphere?		2006-05-17
		Jimmy pose la question : The surface area and volume of a sphere are both equal to the product of 4-digit whole numbers and pi. What is the radius of the sphere? Stephen La Rocque lui répond.
	The volume of water in a sphere shaped water tower		2006-05-14
		Dan pose la question : I work in the water industry, providing automatic controls for water systems. I was wondering if there was a formula for calculating the volume of water in a sphere shaped water tower? With the use of a pressure gauge we know the elevation of zero water {the bottom of sphere) and the overflow elev. (near the top of sphere) I would like to calculate how many gallons are at any elevation in between. Stephen La Rocque lui répond.
	What is the surface area of a cone with a hemisphere on top?		2006-04-20
		Jordan pose la question : How do you find the surface area of a cone with a hemisphere on top? The only information I have is the radius of the hemisphere, which is 4, and the total height, which is 7. Stephen La Rocque lui répond.
	Shapes		2005-11-12
		Tonya and Hailey pose la question : MY THIRD GRADERS TEACHER HAS SENT HOME HOMEWORK ASKING FOR THEM TO FIND REAL-WORLD OBJECT IN MANY DIFFERENTS SHAPES A FEW HAVE US STUMPED Penny Nom lui répond.
	Volumes		2005-10-31
		Diane pose la question : My name is Diane and I am a returning student to a vocational technical school. As a reference point to see what I did/didn't remember from my HS math days, I was sent home with a 75 problem math packet. I was fine until I got to computing: 1. the volume of a cylinder-is it pi r2 h? 2. the volume of a cone- is it pi/3 r2 h? 3. the volume of a sphere- I can't even hazard a guess. Help- my last classroom was 23 years ago, and I've forgotten far too much! Penny Nom lui répond.
	A cube in a sphere		2005-10-19
		Damian pose la question : A sphere passes through the eight corners of a cube side 10cm. Find the volume of the sphere. Penny Nom lui répond.
	A melting ice sphere		2005-07-09
		A student pose la question : A 2 meter diameter sphere of ice melts at 1.5 millimeters per minute. How many minutes will it take to fill up a hexagonal container measuring 1.5 meters on a side, and 0.8 meters deep? Penny Nom lui répond.
	The volume of a sphere. Why 4/3?		2005-05-30
		Lauren pose la question : You know when you find the volume of sphere? I know the formula is V= 4/3 pi r3 but why do they use 4/3? Penny Nom lui répond.
	A torus and a sphere		2005-03-27
		Tony pose la question : Is it possible to shrink a torus into a sphere? Andrei Volodin and Penny Nom lui répond.
	The volume of a sphere		2005-02-25
		Stephanie pose la question : find the volume of a sphere that has a diameter of 12 cm. please show me how to work this problem Penny Nom lui répond.
	The volume of a sphere		2004-11-30
		Lyndsay pose la question : twenty cubic metres of air are pumped into a spherical hot air balloon with each given diameter: 1.0m; 2.0m; 3.0m; 4.0m; 5.0m;6.0m a)calculate the new diameter, new suface area, and new volume of each balloon. Penny Nom lui répond.
	A copper sphere		2004-09-12
		Irfan pose la question : The radius of a copper sphere is 3cm. If a wire of 0.4 diameter is drawn by melting it,what is the length of this wire? Penny Nom lui répond.
	A cube is inscribed inside a sphere		2004-08-18
		A student pose la question : A cube is inscribed inside a sphere with radius sqrt8cm. Find the (a) length of the cube (b) volume of the space inside the sphere but outside the cube. Penny Nom lui répond.
	The volume of a sphere		2004-03-26
		Mike pose la question : I was in class today and I learned how to calculate the volume of a sphere. I understood it easily but can't find the logic behind it. So here are my questions, in the formula why is the radius cubic and not squared? And what does 4/3 have to do with it? Penny Nom lui répond.
	Areas, perimeters and derivatives		2004-02-15
		Geoff pose la question : A recent lecture in my calculus class led me to realize that the derivative of the area of a circle, with respect to the radius is equal to the circumfrence. This also holds true for the relationship between the volume of a sphere and the surface area of that sphere: why do these hold true? why is it only for circular objects? Harley Weston lui répond.
	Non-euclidean geometry		2003-12-08
		Geoffrey pose la question : How can you use non-euclidean geometry to navigate on a sphere? What geometers did work in this area? Chris Fisher lui répond.
	The general equation for a sphere		2003-09-11
		Jaidev pose la question : Is there any general equation for a sphere? Penny Nom lui répond.
	A sphere inscribed in a cone		2003-08-10
		A student pose la question : A sphere with radius 5cm is inscribed in a right circular cone 20 cm in height.find (a) the base radius ,volume of the cone (b)volume of the shaded space( to 3 sig fig) Penny Nom lui répond.
	Surface area of a sphere		2003-07-23
		Rob pose la question : I have a shere with a circumference of 12 feet. What is the total surface area of the shere in square feet and how did you find it? Penny Nom lui répond.
	Surface area of a sphere		2003-03-11
		Kim pose la question : a sphere has a surface area of 128 pi sq. units. What is its exact radius? formula is 4 pi r2 I believe but how do I get radius Penny Nom lui répond.
	Volume of a sphere		2002-08-16
		Rahul pose la question : How do i find the volume of a sphere without the knowledge of calculus? Walter Whiteley lui répond.
	A set of points in space		2002-03-18
		Victoria pose la question : Describe the given set with a single equation or a pair of equations: The set of points in space that lie 2 units from the point(0,0,1) and at the same time 2 units from the point (0,0,-1). Penny Nom lui répond.
	The "pi" of a circle in hyperbolic space		2001-11-19
		Alex pose la question : How can you find the "pi" of a circle in hyperbolic space (or is it the same). I would like to know because our environment is hyperbolic and if the "pi" of hyperbolic space is irrational, it would follow that space is non discrete. I would greatly appreciate any help in this question. Walter Whiteley lui répond.
	Arc of a sphere		2001-03-04
		Some students pose la question : My friends and i have a geometry project and we cannot seem to figure out how to find the arc of a sphere. Harley Weston lui répond.
	Faces		2001-02-21
		Sandy pose la question : How many faces are there on a sphere? What are the faces of a cone? What is the definition of a "face" of a 3D object? Walter Whiteley lui répond.
	Surface area of a contact lens		2000-06-06
		Evie Contreras pose la question : I would like to know how to calculate the surface area of a contact lens with a radius of 7mm? I know that the area of a circle is pi R squared, but a contact lens has a dome. Harley Weston lui répond.
	Volume of a sphere		2000-05-21
		Kevin Partridge pose la question : Does anyone have a way to physically demonstrate how to explain the volume formula for a sphere? Or perhaps how to derive the formula without calculus? Harley Weston lui répond.
	Reflection off a sphere		2000-05-12
		Mark Adami pose la question : Given two points P,E and a sphere. Find a point on the sphere, T, so that a line from P that bounces off the sphere at T goes through point E. Chris Fisher and Harley Weston lui répond.
	Surface area of a sphere		2000-03-22
		Gina Wilkie pose la question : How can I demonstrate to my middle school students the reason for the formula for the surface area of a sphere? Walter Whiteley and Chris Fisher lui répond.
	Angles		2000-01-06
		Rayna pose la question : I am doing a presentation report on angles which has to be fun and entertaining as well as educational. I am having problems locating resources on angles that give me ideas of fun entertaining projects. My lecture is to be about 20 minutes long infront of a class of 11th and 12th graders. Please Help if you can. Claude Tardif and Walter Whiteley lui répond.
	Volume of an ellipsoid		1999-12-06
		Michael Nowicki pose la question : I am a physician at the University of Mississippi. I am trying to compare the size of polyps (abnormal growth of tissue in the colon) between 2 groups of individuals. The department of pathology gives the size as length X width X depth - how do I calculate the volume? Polyps are nearly ovoid in shape. Walter Whiteley lui répond.
	Some Calculus Problems.		1997-10-30
		Roger Hung pose la question : What real number exceeds its square by the greatest possible amount? The sum of two numbers is k. show that the sum of their squares is at least 1/2 k^2. . . . Penny Nom lui répond.
	Three Spheres		1997-01-14
		Alan Schnerch pose la question : Three spheres of diameter 2 are placed on a level surface so that each sphere touches the other two. A fourth sphere, also of diameter 2, is placed on top of the other three so that it touches all of the other spheres. The distance from the level surface to the highest point of the top sphere is . . .. Chris Fisher and Harley Weston lui répond.

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