How do you solve a right triangle when you only know the length of one of the sides?
You find the coterminal angle and take its sine, cosine, or tangent. Cheif SohCahToa says sine opp hyp, cos adj hyp, tan opp adj.
Answered -
About Cosine
The cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.
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