Provides information on the various aspects of trigonometry, including basic lines, angles of the triangle, and trigonomic functions.

Lines and angles -- Angles and their measure -- Triangles -- Congruent triangles -- Identifying congruent triangles -- Ratios and proportions -- Similar triangles -- Right triangles -- Square roots -- The pythagorean theorem -- Using the pythagorean theorem -- The converse of the pythagorean theorem -- Trigonometric ratios -- Trigonometry of right triangles -- All from one -- Complements and cofunctions -- Reciprocal identities -- Trigonometry tables and calculators -- Sine, cosecant, and side length -- Cosine, secant, and side length -- Tangent, cotangent and side length -- Finding the angle measure -- The trigonometric Identities -- Isosceles right triangles -- 30-60-90 triangles -- The unit circle -- Signs of trigonometric functions -- Radians and degrees.