Interactive Peardeck lesson that introduces trigonometric ratios - sine, cosine, tangent - and their inverses. Lesson includes: 1. Identifying the parts of a right triangle (hypotenuse, opposite, adjacent) relative to a reference angle, theta. 2. Setting up trigonometric ratios given two sides and a reference angle3. Evaluating trigonometric functions using DESMOS online graphing calculator4. Setting up equations using trigonometric ratios to solve for missing parts of a triangle (side or angle)