Similar Triangles on the SAT Math #satmathpractice

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Similar Triangles share angles and therefore share ratios between their side lengths. We use this fact to find the cos of an angle on a similar triangle using the side lengths from the similar triangle with the given information. Best, KobeTutors.
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Wtf, I was just looking up how cos was use don my schools chromebook and now this is popping up on my phone?!

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