See also the Dr. Math FAQ: 3D and higher Browse Middle School
Triangles and Other Polygons Stars indicate particularly
interesting answers or good places to begin browsing. Selected
answers to common questions: Pythagorean theorem proofs. -
Rectangle to Parallelogram [06/28/2002] As you change a
rectangle to a parallelogram, what happens to the area and the
perimeter? - Reflecting a Triangle [9/14/1996] A right triangle
is reflected about its hypotenuse. What is the new geometric
figure that is formed? - Regular and Non-regular Polygon Areas
[03/10/1999] Given a regular and a non-regular polygon with the
same perimeter, prove that the area of the regular polygon will
always be greater. - Regular Decagon [03/25/2002] Can you show
me a picture of a regular decagon? - Regular vs. Equilateral
Polygons [07/24/2003] What is the difference between a regular
polygon and an equilateral - The Relation of Perimeter to Area
[10/2/1995] I'm puzzled by the ability of two fences with the
same perimeter to have very differen