Section 7.5 Reference Topics

A discussion some of the historical proofs of the Pythagorean theorem are listed.
http://www.cut-the-knot.org/pythagoras/index.shtml

These sites provide some information about the Great Pyramid.
http://buildings.greatbuildings.com/Great_Pyramid.html

For a more complete (and a bit more advanced) treatment of the sine and cosine functions, see this site:
http://www.hofstra.edu/~matscw/trig/trig1.html

Links