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27 articles trouvés pour ce sujet.

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	La conjecture de Goldbach		2011-02-18
		ahmedbenmoussa pose la question : montrez que tout nombre entier paire supérieur à 4 s'écrit somme de deux nombres premiers Claude Tardif lui répond.
	Nombre d'or		2003-10-31
		Claude pose la question : Comment démontrer que si a/b est égal au nombre d'or alors a+b/a est égal aussi au nombre d'or Comment faut t il choisir a et b pour que le puzzle de lewis caroll soit réalisable? on sait déjà que les nombres 8 et 5 ainsi que 6 et 3 ne sont pas valables. Claude Tardif lui répond.
	le nombre d'or		2000-06-14
		Belhaj Saad pose la question : quel est le nombre d'or? Claude Tardif lui répond.
	Folding a rectangle to preserve the aspect ratio		2015-05-09
		Anna pose la question : If you fold a rectangular piece of paper in half and the resulting rectangles have the same aspect ratio as the original rectangle, then what is the aspect ratio of the rectangles? Penny Nom lui répond.
	Golden Ratio		2013-08-26
		Mark pose la question : Please Help. I'm trying to help my Child and I have no clue on this math question. Rectangular shapes with a length to width ratio of approximately 5 to 3 are pleasing to the eye. The ratio is know as the golden ratio. A designer can us the expression 1/3(5w) to find the length of such a rectangle with width 6 inches. Robert Dawson and Penny Nom lui répond.
	Body measurements		2010-04-06
		Amirul pose la question : Recently I'm proposing my research question to my teacher for my extended essay. I'm an IB student. My research question is regarding the estimation of human in buying trousers through reference of neck. What does the relation between the diameter of the neck and the diameter of the waist? I want to see how far does the estimation theory is true for different type of people with different BMI(body mass index).. But teacher said that it is golden ratio...so nothing interesting... =( really??? But i search on net.... state that my idea seems do not have any relation with the golden ratio so far..... i just want ask you... am I able to perform in my extended essay if i continue with this research question?? Robert Dawson lui répond.
	Depth to height ratio		2009-03-26
		Janet pose la question : Is there a formula to determine how deep something (a cabinet) should be based on how tall it is? Robert Dawson lui répond.
	The Golden Ratio		2009-01-20
		Vincent pose la question : hello, my name is Vince, I am wondering how the Golden ratio was used by early mathematicians. What formula did they use to find it? open for anything... thank You! Robert Dawson lui répond.
	Art and Integers		2008-09-17
		pamela pose la question : how do artists use integers? Janice Cotcher lui répond.
	A sixfold increase		2007-10-24
		Fred pose la question : If I have $500 and it grew to $3,000, what is the correct description of the increase? Is it a sixfold increase (sextupled), or a fivefold increase (quintupled)? When I divide $3,000 by $500, the result is six, therefore, a sixfold increase? Stephen La Rocque lui répond.
	A rectangular sheet of paper is folded along the diagonal		2007-09-01
		Amit pose la question : A rectangular sheet of a paper with dimensions a and b is folded along its diagonal. What is the area of the overlapped region? Harley Weston lui répond.
	Circumscribing a golden cuboid with a sphere: surface areas		2007-06-14
		Ainslie pose la question : A golden cuboid is defined as a rectangular prism whose length, width and height are in the ratio of phi : 1 : 1/phi. Prove that the ratio of the Surface Areas of the golden cuboid to that of the sphere that circumscribes it is Phi : Pi. Stephen La Rocque lui répond.
	Karats		2007-06-01
		Lisa pose la question : What is the karat count of gold in a bracelet that contains 15g of gold and 5 g of silver? Penny Nom lui répond.
	Is zero a number or a place holder?		2007-04-09
		Chris pose la question : Is zero a number or a place holder? Penny Nom lui répond.
	The name of an equation		2006-11-13
		Lee pose la question : I am struggling to find the name of the following equation. I remember watching a TV programme introduced by Arthur C Clarke. The programme focused on an equation that gave a wonderful pattern that went on into infinity. Two maths professors discussed this equation.It was described as 'Gods equation' as it was compared to the shape of trees and other shapes in nature. It was named after the inventor/discoverer. If you have any ideas i would be most grateful. Penny Nom lui répond.
	How old would i be in minutes		2006-08-09
		Mariah pose la question : i would like to know how old would i be in minutes if i was thirteen years old including leap years Stephen La Rocque lui répond.
	Folding a sheet of paper		2005-12-15
		Victoria pose la question : The current problem is to take a normal 8 1/2 x 11 sheet of paper, take a corner and fold it to meet the opposite corner, and (without actually measuring) produce a formula to describe the result fold/crease. Penny Nom lui répond.
	The golden ratio		2004-12-31
		Cristina pose la question : let x represent the longer segment. to find the golden ratio, write a proportion such that the longer of the two segments is the geometric mean between the shorter segment and the entire segment.Use the quadratic Formula to solve the proportion for X. Find the value in both radical and decimal form. Penny Nom lui répond.
	Marching legion		2004-04-24
		Art pose la question : A column of soldiers is 100 meters long. Their sargeant at the rear of the column gives the order to march. The sargeant marches alongside the column to its head and then back to the rear, at which point he gives the order to halt. In all, the column of soldiers has marched 100 meters. How far has the sargeant marched? I say 187.5 meters, but those who teach or who have taught mathematics tell me no. Some say much more and some different. What do you say? Penny Nom lui répond.
	AB/AP=AP/PB		2003-11-20
		James pose la question : My name is James McBride. I'm having a difficult time with a pre calculus problem, which goes as follows: "show that AB/AP=AP/PB is equal to (1+5^1/2)/2 (one plus the sqaure root of five with the sum divided by two. I can't do the square root sign, sorry.) I have tried to solve for PB in terms of the other varialbles and then work the quadratic equation. THAT DOES NOT WORK!!!! I am befuddled. Please help me. I am a student of secondary level. Penny Nom lui répond.
	The golden ratio		2003-09-23
		Phillip pose la question : The Golden Section can be made from an equilatereral triangle inscribed within a circle. The Golden Section is achieved by joining the mid points of two arms of the triangle to the circumference. I can prove this by erecting a perpendicular to the line outside the circle, but am interested to see how it can be proved from within the circle. Chris Fisher lui répond.
	Three goldfish		2001-05-30
		Nathan pose la question : A man has three goldfish. When the youngest goldfish was born, the oldest fish was three times the middle fish's age. Nine years ago the oldest fish's age was the sum of the two other fish's ages. How old are the three goldfish? Penny Nom lui répond.
	Manifolds		2001-05-14
		Thierry pose la question : Maybe you could help me, because I have serious problems for the translations of an English mathematic word which is "MANIFOLD". It's impossible to have a clear translation in French. Do you have a solution? Claude Tardif lui répond.
	Crown molding mitre cuts		2000-11-06
		Jim Tomfohrde pose la question : My question has to do with making mitre cuts when installing crown molding. Crown molding is the trim that is put up at the top of walls with one edge on the wall and the other edge on the ceiling. To make a mitre cut on your mitre saw for a 90-degree corner you can lay the molding flat on the saw base, set the bevel of the blade to 34 degrees and the mitre to 31.5 degrees (these may be slightly appoximate). Of course depending on which piece of molding you're cutting you will cut one end or the other, or use the left or right end. These angles allow the cuts to line up and form a seamless corner when they're put in place on the wall/ceiling at 90 degrees. My question is this - is there some mathematical formula from which the 34 degrees and 31.5 degrees are derived. I want to know this because in many cases the corner is not 90 degrees but can be more or less, and in these instances I would like to know if I can calculate the bevel and mitre to use based on the angle of the corner. Harley Weston lui répond.
	Folding a page		2000-03-01
		Krista Bischoff pose la question : One corner of a page of width a is folded over and just reaches the opposite side. Express L, the length of the crease, in terms of x and a. I can't get the picture to copy to this form so I guess I will have to try and describe the picture the best that I can. The top right hand corner is folded to the left side, almost half way down. The width of the paper is a ( the width of the bottom part which is not folded.) The creased side is L and the part shorter part of the folded area is x (the part that would have been the top right of the original piece.) Chris Fisher lui répond.
	Fibonacci Numbers		1999-12-15
		Gary Nelb pose la question : I'm doing a project on fibonacci numbers and I'm using different starting values and finding out if different starting values to see whether or not the ratios still get closer to phi. I was wondering, what numbers should I use. Should I use two of the same # like 2 and 2, or numbers like 1 and 2, or even something totally different. Denis Hanson lui répond.
	What is the golden section?		1995-09-17
		Cindy pose la question : What is the golden section of a line? Denis Hanson lui répond.

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