Question

what is cos a?
cos a =
√17
8
9

Explanation:

Step1: Recall the cosine formula

In a right - triangle, $\cos A=\frac{\text{adjacent}}{\text{hypotenuse}}$.

Step2: Identify the adjacent side and hypotenuse

The adjacent side to angle $A$ is $8$, and the hypotenuse is $9$.

Answer:

$\frac{8}{9}$