The Right Triangle and the Cosine Function


A Right Triangle Relative to angle A, this is how the sides of a right triangle would be labeled.

The cosine of angle A equals the length of the adjacent side divided by the length of the hypotenuse.

We could write:

cos(A) = adj / hyp

So, for example, if the length of the adjacent side was 8 and the length of the hypotenuse was 10, then we would write:

cos(A) = 8 / 10

cos(A) = 0.8000



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