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	Two chords		2020-04-14
		Frank pose la question : How to find the length of the radius of a circle if you know the lengths of two chords Penny Nom lui répond.
	The center and radius of a circle		2020-03-25
		Riley pose la question : so it says find the center and the radius of the below circle x^2+(y-6)^2=121 i need help learning how to solve this Penny Nom lui répond.
	The radius of a circle of given area		2019-08-14
		shelby pose la question : What's the radius of a circle that has an area of 803.84cm2? I also need examples of how you got the answer. 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.
	The top of a truncated cone		2018-12-02
		Sameer pose la question : Bottom cone radius 1124.height is 200. Top radius 15degree decree to bottom radius. Top radius how much ? Penny Nom lui répond.
	Forming a cone from a circle		2017-04-15
		Tasha pose la question : A sector of a circle subtends an angle of 216 degrees at the centre, If this sector is used to form a cone of vertical height ,8cm, calculate the base radius of the cone Penny Nom lui répond.
	The area and radius of a circle		2016-12-19
		india pose la question : How do you find the radius of a circle if only the area is given to you? Penny Nom lui répond.
	Radius angle and arc length		2016-11-24
		pavidthra pose la question : Length or arc 11 and angle of subtended 45.need to find a radius Penny Nom lui répond.
	A circle formed from bending a wire		2016-10-16
		Deszaree pose la question : The same piece of a wire is bent to form a circle calculate: a, the radius of the circle b, the area of the circle Penny Nom lui répond.
	The radius of a coffee cup		2016-09-12
		Brett pose la question : What is inside radius, in centimeters of a coffee cup if it holds 350g of coffee when filled to a depth of 9.5 cm? Assume coffee has the same density of water, 1.00g/cm3. A numeric value is expected and not an expression. Penny Nom lui répond.
	A chord of a circle, the central angle and the radius		2016-01-26
		Nishan pose la question : If chord length is given along with angle then how to calculate the radius. 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.
	The radius of a cylinder		2015-02-26
		Rose pose la question : Hi. I want to know how to find the radius of cylinder. When I have height (35cm) and area of the curved surface(880sq.cm). I know the formula is 2πr(h+r). But I can't understand how to find it's radius. Please help me. I really need your help. Penny Nom lui répond.
	The center and radius of a circle		2015-02-06
		ariana pose la question : I need to find the center and the radius of this circle. I don't know how to put 9/2 than square it into a fraction. x^2 + 2x + y^2 +9y=5 Penny Nom lui répond.
	How does pir^2 = 1/4pid^2?		2014-10-14
		al pose la question : Hi I cant work out the algebra. How does pir^2 = 1/4pid^2 Thanx Penny Nom lui répond.
	A cable around the Earth		2014-03-13
		fikile pose la question : By how much must an equatorial cable be extended in order that it runs 1meter above the ground? Penny Nom lui répond.
	The length and depth of a chord		2012-08-16
		Tim pose la question : Can I find the radius of a circle, if I have a chord of 2400mm, and a depth between the center of the chord and the perimeter of the circle of 150mm ? Thanks Tim Penny Nom lui répond.
	The radius of a circle		2012-01-12
		Janie pose la question : Find the radius of a circle knowing that a chord of 24.6 inches has a corresponding arc of 70°. Penny Nom lui répond.
	The circumference and area of a circle		2011-12-13
		Mable pose la question : A circle that going 70mi across using 22/7 I need the area,radius, and the circumference and how to set up the steps can you help? Penny Nom lui répond.
	The radius of a cylinder		2011-04-27
		Jazmin pose la question : Hi, I don't understand how to find the radius in a cylinder with only the surface area (143.7) and the height (0.8)? I know that the formula is 2pir2+2pirh, but I don't see how to isolate the r? I appreciate your help. Penny Nom lui répond.
	A 400 gallon drum		2010-11-04
		Jerry pose la question : Question from Jerry: I want to build A tank. able to hold 400 gallons of asphalt sealer it will be round . basically like A old fuel oil drum but made with heavy material . math ? was I want tank to hold 400 gallons I think the length of 60" would be perfect. I don't know what diameter or radius of tank needs to be . to make it A 400 Gallon tank Harley Weston lui répond.
	The distance from a chord to an arc		2010-02-11
		matt pose la question : hello, I have to layout a radius without being able to pull from the center my radius is 3819.53 feet and i have a chord length of 275.59 feet if i broke that up into 25.05 feet sections how would i calculate the lengths from my chord to that radius? Robert Dawson lui répond.
	A tunnel from Toronto to Montreal		2010-01-25
		Dave pose la question : I want to make a tunnel from Toronto to Montreal (for example) Something like this http://mathcentral.uregina.ca/QQ/database/QQ.09.09/h/grant1.html ------------- My coordinates are 45.442455,-73.861340 (Montreal) and 43.442455, -79.861340 (Toronto) I need to know how to find arc distance, chord distance and radius What websites can i find for this subject Google has many but they are useless (blah blah) websites LOL Thanks Chris Fisher and Robert Dawson lui répond.
	The inradius of an icosahedron		2010-01-21
		fnavroth pose la question : Suppose you have an equilateral triangle. The area of the triangle is exactly 1200 square centimetres. Now suppose you have twenty of those triangles. It's possible to assemble those twenty triangles into a closed three-dimensional shape, a regular polyhedron. What would be the volume, in cubic centimetres, of the largest sphere that could fit inside the shape? Chris Fisher lui répond.
	A question from a boat builder		2010-01-01
		Grant pose la question : I am a boat builder, trying to lay out shape of side's elevation. My question is, how do I define the length of a circle's radius, if I know the chord length (20 ft) and the segment of the radius between the chord and the circle is known (7 inches)? Penny Nom lui répond.
	Chord length given the length & radius of an arc		2009-12-31
		Wayne pose la question : Given the length & radius of an arc, is there a formula that will accurately calculate the chord length? I'm an architectural designer, and would need it explained in layman's terms. Thank you. Wayne Penny Nom lui répond.
	Sagitta		2009-09-10
		Robert pose la question : Can you please tell me if there is a formula to figure out the Sagitta of an arc when you know the radius, chord length, and arc length? Chris Fisher and Harley Weston lui répond.
	The layout of an arch		2009-08-18
		Steven pose la question : I am trying to layout a large radius between 2 points in a building and need a formula to figure different senarios for example: radius is 187'6" distance between 2 points is 34'8" need points 16" apart along the line between the 2 points to create the radius please help Stephen La Rocque lui répond.
	The radius of an arc		2009-06-12
		Billy pose la question : I have tried using the formula 4h2(squared)plus L2(squared)divided by 8h to find the radius of an arc, but I must be doing something wrong since I keep getting the wrong answer. Can you tell me what I am doing wrong. The height is 37.75 in. and the length is 18.875 in. Thank you for any help you can give me. 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.
	The radius of a circle		2009-03-22
		Justin pose la question : Find the radius of a circle with a circumference of 9.43cm. Penny Nom lui répond.
	The radius of a cone		2009-01-02
		kalpaj pose la question : A conical funnel holds 100ml. If the height of the funnel is 10 cm, determine its radius, to the nearest tenth of a centimeter. Penny Nom lui répond.
	Finding the Distance Between Two Latitudes		2008-10-02
		Samua pose la question : Assuming that the Earth is a sphere of radius 4000 miles and that the cities are on the same longitude (one city is due north to the other). Find the distance between the cities with the latitudes of 37 degrees 47'36'' and another city with 47 degrees 37'18''. Heeeeeeeeeeelp! Janice Cotcher lui répond.
	A string around the world		2008-08-18
		Terry pose la question : I heard this on T.V. and was wondering if it was true. Place a string around the world, you would need 25,000 miles of string. If you raised the string off of the ground by 1 foot all the way around. How much more string would you need? Penny Nom lui répond.
	Arc-length and sector-angle		2008-08-06
		Benson pose la question : If chord length, radius are given, How to find the sector angle and arc-length Janice Cotcher lui répond.
	Chords and arcs		2008-07-11
		Ronnie pose la question : We are trying to build a semi life size ark decoration , and we are trying to cut the sides out . The curved sides and we can't figure our radius , all we know is that our chord length is 24ft. any suggestions on how to find the radius or maybe even the arc length or circumference or diameter? Harley Weston lui répond.
	CIRCLES		2008-07-07
		daryl pose la question : Find the equation of the smaller circle that is tangent to the axes and the circle x(squared)+y(squared)=2x+2y-1? Penny lui répond.
	If the arc is 75mm, what is the radius?		2008-06-12
		malcolm pose la question : If the are is 75mm, what is the radius? Janice Cotcher and Harley Weston 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.
	The radius of a circle		2008-04-25
		kathy pose la question : How do you find the radius of a circle if the area is 803.84 and using 3.14 for pi. Penny Nom lui répond.
	Finding the radius when only given chord length		2008-04-03
		Lorraine pose la question : There are two chords in a circle, an 8 inch chord and a 10 inch chord. The 8 inch chord is twice the distance from the center as the 10 inch chord. What is the radius? Stephen La Rocque lui répond.
	The radius of a circle		2008-03-22
		danny pose la question : waht is the radius of a circle, if the circumference is 800? Penny Nom lui répond.
	The centre and radius of a circle		2008-03-12
		Ryan pose la question : hello and thank you for such a wonderful service. This problem I think needs to be checked could you take a gander at it and tell me if i get it correct thanks find the center and the radius of this circle x^2+y^2=8x-2y+15=0 I cam up with center -2, 1/2 and a radius of 11 3/4 Harley Weston lui répond.
	The radius of a circle		2008-02-28
		SteVonee pose la question : Estimate the radius of a circle with the given circumference that is 192ft Penny Nom lui répond.
	I cut the cylinder at a 45 degree angle		2008-02-26
		Shannon pose la question : I have a cylinder with a radius of 2' 1 5/8". How do I calculate the radius increase when I cut the cylinder at a 45 degree angle? Harley Weston lui répond.
	The circumference and radius of a circle		2008-02-10
		Ray pose la question : How do you find the circumference or radius of an area presuming it is a circle. Or in other words how do you find the c or r given only the area is 50 sq metres Penny Nom lui répond.
	Finding the area of an isosceles triangle given one angle and the inradius		2008-01-24
		Saurabh pose la question : Given an isosceles Triangle, whose one angle is 120 and inradius is √3. So area of triangle is? Stephen La Rocque lui répond.
	The radius of a planet		2008-01-06
		Ben pose la question : Two people who are both h feet tall are standing on a spherical planet. One person walks a distance d in feet away from the the other person. At this point, the person walking turns around and can no longer see the top of the other persons head. What is the radius of the planet? Stephen La Rocque and Harley Weston lui répond.
	A radius and a tangent to a circle		2007-12-04
		elizabeth pose la question : show that the radius of a circle meets a tangent line to the circle in a 90 degree angle. hint: start by assuming they are not perpendicular and at a contradiction. Penny Nom lui répond.
	Find the radius of a circle given the center and a point on the circle		2007-11-18
		Raymund pose la question : Find the radius if the center is at (0, -5) and one point on the circle is (2,3) Stephen La Rocque lui répond.
	The radius of an arch		2007-11-10
		Mark pose la question : How do you determine the raduis or diameter of a circle based on the folowing information: 1. The distance along the circle between two points is 35'-2". This creates an arch. 2. The (chord) distance between the two points is 30'-8". 3. The distance from the center of the chord (on a 90 degree) to the arch is 6'-10 3/4". Harley Weston lui répond.
	How do you find the radius of a circle if you only know its area		2007-10-15
		s pose la question : how do you find the radius of a circle if you only know the area of the circle. Do you somehow reverse the Pi formula. Penny Nom lui répond.
	Given the arc length and chord length, what is the radius?		2007-10-10
		Wayne pose la question : I have the actual length of an arc plus the length of the cord. How do I determine the radius of the arc. Harley Weston lui répond.
	Arc lengths, central angles and radii		2007-10-04
		Ashutosh pose la question : Jose can remember that the length of an arc is 440cm, but he cannot remember the radius of the arc or the angle at the center. He does know that the angle was a whole number of degrees and the radius was less than 100cm. Find three possible angles and write down the size of each of the possible radii. Stephen La Rocque lui répond.
	Area of a circular garden		2007-06-18
		Cynthia pose la question : Hi is this the correct formula for this problem? What is the approximate area of a circular garden that is 20 feet in diameters? Stephen La Rocque lui répond.
	Area of region between circle and inscribed octagon		2007-05-07
		amy pose la question : I have to find the area of the shaded region where there is an octagon inscribed in a circle The radius is 4 inches. The shaded region is everything besides the octagon inside the circle. How can I find the area of the shaded region? Thank you! Stephen La Rocque lui répond.
	An arc shaped groove into a peice of metal		2007-04-12
		daniel pose la question : hello i work at an engineering workshop the other night i was asked to machine an arc shaped groove into a piece of metal the cord length was 6 mm and the height from the middle of the cord to the arc was 1mm i was hoping to find the diameter of the cutter needed to do the job and also the formula to work out how to find the diameter. i believe it is 10mm dia thankyou for your time and knowledge Stephen La Rocque lui répond.
	The centre and radius of a circle		2007-01-27
		A student pose la question : x^2+y^2=121 is the equation of the Circle C (1) Write down the center and the radius of C. Stephen La Rocque lui répond.
	An arc, a cord and the radius of a circle		2007-01-14
		Kevin pose la question : I have the length of the cord and the distance from the cord to the arc, is it possible to find the radius with just these parameters? Penny Nom 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.
	The radius of an arch		2006-11-15
		Kelly pose la question : I am trying to achieve an arc height of .375 on the length of 17.375. Penny Nom lui répond.
	The radius of a cone		2006-09-08
		Hermanson pose la question : I know the cone is 20 degrees at the top and 80 degrees at the bottom. What is the formula for finding the radius? Stephen La Rocque lui répond.
	Find the radius knowing the chord length and...		2006-07-28
		Jim pose la question : If I know the length of a chord and its distance from the diameter, how do I calculate the radius of the circle? Stephen La Rocque lui répond.
	Three circles inside a larger circle		2006-04-16
		Meghan pose la question : Given three congruent circles tangent to one another (radii = 1), what is the radius of a circle circumscribed around them? Stephen La Rocque lui répond.
	The centre and radius of a circle		2006-04-02
		Kaye pose la question : I need to calculate Dimension E and F. I am given A, B, C, (or over all A+B+C), D, G. The radius is one continuous unknown radius. Example: A = 23.50 B = 35.50 C = 0.50 D = 11.50 G = 23.50 I have calculated this for angles but my mind is drawing a blank for the radius calculation. I can draw it but I need to put into Excel spreadsheet. Harley Weston lui répond.
	The diameter of a pipe		2006-01-27
		An other pose la question : I know the base length of my arc (10 inches) - I also know the height at the center to the arc (2 inches). I don't think the end is at the midpoint tho. How do I figure out how long the arc length is? My question involves being able to cut a round pipe into an arc that is 10 inches wide and 2 inches tall. I need to know the smallest diameter pipe to buy in order to fulfill these requirements. Penny Nom lui répond.
	Measuring an octagon		2006-01-26
		Travis pose la question : I am looking to do a project for work where I must find the radius of an octagon but I cannot directly measure it. I've found that on a regular hexagon I can find the radius by using the distance between the bolts to find the radius to the line connecting the bolts but also to the outside of a circle to cut it out. I do not understand however how this works for an octagon. What do I do to find the radius of an octagon with only the ability to measure the distance of the bolts? The center has a cutout in it and is mounted currently and I cannot get accurate measurements. Penny Nom lui répond.
	How would I find the length of the radius?		2005-10-15
		Stace pose la question : If given the length of a chord (121") and the distance from the midpoint of the arc to the midpoint of a chord (12"), how would I find the length of the radius? Penny Nom lui répond.
	What is the radius of this planet		2005-08-05
		Kelly pose la question : Assuming that a North-South line has been established, you set up two camps that are 67 miles apart. You now set up poles at each camp perpendicular to the ground. On a certain day at "noon" the pole at the South camp casts no shadow, while at the North camp a shadow is cast. The shadow makes an angle of 89 degrees with the horizontal. What is the radius, diameter, and circumference of this planet? Chris Fisher lui répond.
	The radius of a circle		2005-01-18
		A student pose la question : find the radius of a circle whose area is 1256sq cm.Use pi as an appoximation for pi. Penny Nom lui répond.
	A line from the center of the patch to the periphery		2005-01-01
		Sandrine pose la question : I am currently researching a patch disease of grasses. These patches are roughly circular. I need a term for a line from the center of the patch to the periphery. Since the patches are not perfectly circular, my supervisors tell me I cannot use the word 'radius'. What else could I use? Denis Hanson and Harley Weston lui répond.
	The radius of a circle		2004-08-24
		Peter pose la question : If you slice any circle with a line, and call the distance of the line between intersections the "y" length and the perpendicular length to the shorter side of the curve the "x" length, what is the resulting equation for the radius? Penny Nom lui répond.
	The circle through three points		2004-07-06
		Jim pose la question : I am a student trying to solve math problem. I'd like to calculate the radius of the circle that exactly fits any three points. If the points are (X1,Y1), (X2,Y2), and (X3,Y3), what is the radius of the circle that contains those three points? Penny Nom lui répond.
	The radius of a circle		2004-03-06
		A student pose la question : what is the radius of a circle with the circumference of 12 inches? Penny Nom lui répond.
	Circumference		2003-05-09
		A parent pose la question : Find the circumference use 3 1/7 for pi 1. r= 28 ft. 2. D=98 cm 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.
	Wrap a rope around the equator		2003-02-12
		Ali pose la question : If you take a rope and wrap it around the equator and then overlap it 6ft. and cut off the extra then you loosen it up so the ends meet how far would it stand off the ground? Penny Nom lui répond.
	The length of an arc		2002-11-27
		Nancy pose la question : If all I have is the length between 2 ends of an arc (72"), how do I find the length of the arc at its apex and the radius? Penny Nom lui répond.
	How would you find the length of the chord?		2002-10-31
		A draftsperson pose la question : If given the length of an arc and the distance from the midpoint of the arc to the midpoint of a chord, how would you find the length of the chord and the radius of the arc. The chords endpoints are the same as the the arcs endpoints. Penny Nom lui répond.
	A Circle is evenly divided into six equal triangles		2002-09-16
		Marilynn pose la question : A Circle is evenly divided into six equal triangles leaving an area between the outside of the circle and the one side of the triangle. This area is measured as 3.14. What is the length of the radius, one line on the triangle? Paul Betts lui répond.
	Diameter of a pipe		2002-02-16
		Landry pose la question : I am trying to calculate the dia. of a pipe 60 inches long that will hold a gallon of water. What is the formula? Penny Nom lui répond.
	The radius of a planet		2001-07-30
		Jessica pose la question : A satellite is orbiting the earth at an altitude of 100 miles. If the angle of depression from the satellite to the horizon is 50 degrees, what is the radius (to the nearest mile) of the planet? Harley Weston lui répond.
	A chord length		2000-10-17
		Al Paas pose la question : How to determine the length of a chord given the diameter of the circle and the maximum distance from the chord to The circle? Chris Fisher lui répond.
	A problem with a radius.		2000-02-01
		Howard B Davis pose la question : We start a Line that goes up 1 unit, then it goes to the Right for 5 units long, and then goes down 1 unit which is the end point. If we draw a circle that is tangent to both ends as well as the mid-point of the horizontal line: How do we find the radius of the arc; in Mathematics, with only this information? Chris Fisher lui répond.
	The circumference of a circle		1999-10-05
		Mara Frost pose la question : what is the formula to find the circumference of a circle, or if there is no formula, how do you find the circumference of a circle? Penny Nom lui répond.
	Radius of an arc		1999-04-22
		Rusty Riddleberger pose la question : I need to find the equation for finding the radius of an arc; I know the length of the arc (i.e the distance of the line connecting the two ends of the arc) and the height; (i.e the rise of the arc at its apex,) I had the formula years ago but it has lost me; this would be invaluable for work in new homes i.e. where we need to build an "arch" with a rise of 21" between two columns 11 feet apart Chris Fisher lui répond.
	Radius of convergence		1999-04-21
		Nowl Stave pose la question : Why is the radius of convergence of the first 6 terms of the power series expansion of x^(1/2) centered at 4 less than 6? Harley Weston lui répond.
	Circles		1999-04-21
		Alex Elkins pose la question : How do you find the circumference of a circle if you only know the radius and the square feet or inches of the circle if the radius is 18 inches, If done in inches do you multiply by 12 to get the square feet? Jack Lesage and Harley Weston lui répond.
	Pi		1997-10-31
		Ryan McKinnon pose la question : What Is Pi? Chris Fisher lui répond.
	A tangent to a circle is perpendicular to the radius at the point of contact.		1996-10-22
		Rita Leung pose la question : I wonder if there is any proof for this theorem - A tangent to a circle is perpendicular to the radius at the point of contact. If there is any proof for that, can you tell me please? Chris Fisher and Harley Weston lui répond.

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