Begins with a review of Trigonometry Part 1: similar triangles and corresponding angles, names of the sides of a right triangle, and tangent formulas. Then explains how to find the sine and cosine of an angle. To remember ratios suggests using the acronym "SOHCAHTOA." Tells how to find an unknown angle in right triangles using a mathematics calculator. Gives practice in using trigonometric ratios to solve problems.