The Right Triangle and the Tangent Function


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

The tangent of angle A equals the length of the opposite side divided by the length of the adjacent side.

We could write:

tan(A) = opp / adj

So, for example, if the length of the opposite side was 6 and the length of the adjacent side was 8, then we would write:

tan(A) = 6 / 8

tan(A) = 0.7500



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