# How Do You Find a Missing Side of a Right Triangle Using Cosine?

Trigonometry? What's trigonometry. Well, something to do with triangles, right? Right! Right triangles! In this problem, find the missing length of one of the sides. So set this up as a ratio: cosine(A) = adjacent side length divided by the length of the hypotenuse. Still not sure what to do? Then watch this video as the instructor walks through the steps.

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