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Activities in Math: Trigonometry [ Teens/Mature Teens ] - Three comprehensive modules from Syvum. Each includes theory and explanation, along with practice exercises.
Dave's Short Trig course [ Teens/Mature Teens ] - Covers basic definitions and concepts in beginning trigonometry.
Four Branches of Trigonometry [ Mature Teens ] - Includes information on the laws of sines and cosines, right triangle trigonometry, and the ambiguous case.
An Index of Trigonometry Help Pages [ Teens/Mature Teens ] - Provides detailed discussion of trigonometry concepts. Includes examples of varying difficulty.
An Introduction to Trigonometry [ Teens/Mature Teens ] - Definitions, basics, functions, and other concepts necessary to understand basic trigonometry.
Marlene's Trigonometry Calculator [ Teens/Mature Teens ] - Learn the basics, the solutions, and how to convert from degrees to radians.
Sine and Other Trigonometric Functions [ Mature Teens ] - Interactive tests and exercises.
S.O.S. Math - Trigonometry [ Mature Teens ] - Covers measuring degrees, equations, and formulas. Includes illustrations and related links.
Trigonometry [ Mature Teens ] - Introduction to trigonometry. Includes links to trig-based animations and definitions.