Define trigonometric ratios and solve problems involving right triangles. Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.
Resource we found that are aligned to this standard
A task aimed at using the notion of similarity to define the sine and cosine of an acute angle.
A set of 9+ questions created by Khan Academy's Tomer Gal.