Lesson: Trigonometric Ratios in Right Triangles Mathematics • Third Year of Preparatory School

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In this lesson, we will learn how to find and express the values of the three trigonometric ratios—sine, cosine, and tangent—for a given angle in a right triangle.

Lesson Plan

Students will be able to

find any trigonometric ratios in a right triangle given at least two of its sides,
find a trigonometric ratio in a right triangle given another trigonometric ratio.