Trigonometry › Sides of right triangles

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Your friendly hypotenuses, opposites, and adjacents

CCSS.MATH.CONTENT.HSG.SRT.C.6
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.

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https://schoolyourself.org/page/lti/sy/trigonometry/side-names

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