This document contains information about trigonometric functions and examples of using them to solve for unknown angles. It defines the sine, cosine, and tangent functions using ratios of sides of a right triangle. It then provides two example problems, finding the measure of angles A and B in a triangle where the sides are given. The solutions show setting up and solving the trigonometric ratios to determine the angle measures are 49°32' for angle A and 40°42' for angle B.