Cosine, sine and tangent are defined. The Pythagorean theorem is illustrated as well the number of degrees in a many sided figure. abe.www.ecn.purdue.edu/~agen215/trig.html
Explains right triangle properties, historic background, the Pythagorean theorem, and trigonometric functions. Includes definition of terms and illustrations. www.gcse.com/maths/trigonometry.htm
Describes how the Sine and Cosine Addition Formulas can be derived by using vectors and how these formulas can be remembered relatively easily. www.pitt.edu/~wek3/sineadd/node1.html
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