Question

Find cos angle∠ C
A. 5/13
B. 12/13
C. 12/5
D. 13/5

Answer 1

The answer is A.

Explanation:

Recall SohCahToa, which tells us that cosine is the ratio of the adjacent side to the hypotenuse. In other words:

`\displaystyle \cos(x)=\frac{\text{adjacent}}{\text{hypotenuse}}`

The adjacent side to ∠C is 10 and the hypotenuse is 26.

Therefore:

`\displaystyle \cos(C)=(10)/(26)=(5)/(13)`

Our answer is A.