Question

find cos(a). reduce the ratio if necessary.

Explanation:

Step1: Recall cosine ratio formula

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

Step2: Identify adjacent and hypotenuse

For angle $A$, the side adjacent to $A$ is $AB = 30$ and the hypotenuse is $AC=50$.

Step3: Calculate cos(A)

$\cos(A)=\frac{30}{50}=\frac{3}{5}$

Answer:

B. 3/5