NC.M2.G-SRT.6
Verify experimentally that the side ratios in similar right triangles are properties of the angle measures in the triangle, due to the preservation of angle measure in similarity. Use this discovery to develop definitions of the trigonometric ratios for acute angles.
Khan Academy ResourcesSide ratios in right triangles as a function of the anglesTrigonometric ratios in right trianglesHypotenuse, opposite, and adjacentTrigonometric ratios in right trianglesUse ratios in right trianglesTrigonometric ratios in right trianglesUsing similarity to estimate ratio between side lengthsTriangle similarity & the trigonometric ratios

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