This document provides examples and exercises on applying trigonometric ratios (sine, cosine, tangent) to solve problems involving right triangles. It begins by naming trigonometric ratios and defining sine, cosine and tangent. Examples are provided to calculate sine and cosine values. Follow-up exercises involve using trigonometric ratios to find missing side lengths of right triangles or calculate angle measures. Special right triangles and their related trigonometric ratio values are also discussed.