Drexel dragonThe Math ForumDonate to the Math Forum

The Math Forum Internet Mathematics Library

Trig According to Euclid

Library Home || Full Table of Contents || Suggest a Link || Library Help

Visit this site: http://www.math.uaa.alaska.edu/~smiley/trigproofs.html

Author:Len Smiley, Deborah Smiley
Description: Four figures proving trigonometric addition and subtraction formulas for cosine and sine. Free of Cartesian coordinates, the proofs are synthetic and use a common, minimal diagram from Euclidean geometry.

Levels: High School (9-12), College
Languages: English
Resource Types: Graphics
Math Topics: Trigonometry

[Privacy Policy] [Terms of Use]

Home || The Math Library || Quick Reference || Search || Help

© 1994- The Math Forum at NCTM. All rights reserved.