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.
Khan Academy ResourcesSide ratios in right triangles as a function of the anglesTrigonometric ratios in right trianglesTrigonometric ratios in right trianglesUse ratios in right trianglesIntro to the trigonometric ratiosTrigonometric ratios in right trianglesUsing similarity to estimate ratio between side lengthsTriangle similarity & the trigonometric ratios
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