Question

score: 2/10 current time: 86.3 find: \\( \cos b \\) answer \\( \frac { 7 7 } { 8 5 } \\) \\( \frac { 7 7 } { 3 6 } \\) \\( \frac { 3 6 } { 7 7 } \\) \\( \frac { 3 6 } { 8 5 } \\)

Explanation:

Step1: Recall the cosine formula

In a right - triangle, $\cos\theta=\frac{\text{adjacent}}{\text{hypotenuse}}$. For angle $B$, the adjacent side is $36$ and the hypotenuse is $85$.

Step2: Calculate $\cos B$

Using the formula $\cos B=\frac{36}{85}$.

Answer:

$\frac{36}{85}$