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Common Core suggests: "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.".
Find Measures of Angles Using Sin, Cos, Tan - Expii
Right Triangle Trig: Intro Investigation
Find Sin, Cos, Tan from Lengths of Triangle Sides - Expii
Right Triangle Trigonometry
Right Triangle Trigonometry - Basics of Right Triangle Trigonometry
Right Triangle Trigonometry
Find Measures of Angles Using Sin, Cos, Tan - Expii
Right Triangle Trigonometry - Basics of Right Triangle Trigonometry
Trigonometric Functions in a Right Triangle
