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	Reflection in the line y = x		2010-07-21
		tousif pose la question : Find the 2 x 2 matrix which represents a reflection in the line y = x? Please help.... Penny Nom lui répond.
	An altitude of the triangle intersect a side of the triangle		2010-01-23
		Sarah pose la question : In what type of triangle does an altitude of the triangle intersect a side of the triangle at its midpoint?? -Sarah Walter Whiteley lui répond.
	Symmetries of a polyhedron		2009-03-02
		Vincent pose la question : I want to ask is there a formula to find out the number of axes of rotation & plane of reflection of a 3D figure, like pentagon, pyramid? Chris Fisher lui répond.
	A reflected line segment		2008-07-14
		Peter pose la question : Segment AB has endpoints A(-1,2) and (3,1). Segment AB is reflected over the y-axis such that A becomes A' and B becomes B'. What is the positive difference between the lengths of segment AA' and segment BB'? Janice Cotcher lui répond.
	Two mirrors		2007-10-24
		Peter pose la question : The reflecting surfaces of two intersecting flat mirrors are at an angle θ (0° < θ < 90°). For a light ray that strikes the horizontal mirror, show that the emerging ray will intersect the incident ray at an angle β = 180° – 2θ. Stephen La Rocque lui répond.
	Mini Golf		2006-08-17
		Sarah pose la question : I am a sixth grade teacher in Minnesota. I want to have my students explore mini golf and calculate the reflections and angles so that they can figure out how to hit a hole in one. I know that my daughter had various problems like this in eighth grade geometry, but I can't seem to find any internet activities of the appropriate level. Stephen La Rocque lui répond.
	Mini Golf geometry		2006-07-18
		Sarah pose la question : I want to have my students explore mini golf and calculate the reflections and angles so that they can figure out how to hit a hole in one. I know that my daughter had various problems like this in eighth grade geometry, but I can't seem to find any internet activities of the appropriate level. If you can steer me towards any resources, I'd be most grateful. Natasha Glydon lui répond.
	A sequence of transformations		2005-01-03
		Abraham pose la question : Please go to this web site and look at number 31. http://www.nysedregents.org/testing/mathre/matharch/mathbtestau02.pdf That is the New York state education web site. Can you tell me if my answer would be marked correct? My answer was Transformation of 4,-3 (T 4,-3) followed by a reflection in the x-axis.If I graphed the question and wrote that, would I get full credit Harley Weston lui répond.
	Transformations of pattern blocks		2003-02-06
		Cheryl pose la question : I am trying to help my 8th grade son with Transformations - use of patttern blocks. He has to trace a figure and reflect it across the x-axis, which I can do, but then it indicates include ordered pairs - that confuses me. Penny Nom lui répond.
	Moving a triangle		2002-04-18
		A student pose la question : find the verticles of a triangle after it is translated 2 units to the left and then is reflected across the graph of y=x+2. The original verticles of the triangle are (2,0), (3,2), and (6,2). Peny Nom 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.
	The three jugs problem		1999-09-02
		Kent Lane pose la question : I wonder if you could help me figure out this secondary Discrete Math Problem. I cannot figure out where this comes from. Here's the question: You have three containers. Container 1 is a three (3) liter container. Container 2 is a five (5) liter container. Container 3 is an eight (8) liter container that is full of liquid. The goal is to get 4 liters in one of the containers. Stipulations: There are no marks on the containers to measure out the liquid. All you know is that 1 is 3 l., 2 is 5 l., and 3 is 8 l. full of liquid. Chris Fisher lui répond.
	Shape-preserving transformations		1999-05-04
		J McAndrew pose la question : A shape preserves its shape if a rotation, translation or scaling is performed on it. Are these the only continuous transformations which have this property? These transformations if performed on the parts and then summed have the same effect as the transformation being applied to the whole; are these linear transformations? Who, and what area of mathematics has classified all transformations of this type completely? Chris Fisher lui répond.
	Frieze Patterns		1998-08-19
		Brian Bairstow pose la question : I am doing a research project on frieze patterns (also called band patterns or border patterns). I know that there are exactly seven different types of frieze patterns, but I have been unable to find a proof for this. If you could tell me this proof, or tell me some internet sites on which I can find material on this, I would be very grateful. Chris Fisher lui répond.

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