Question

find: \\( \cos b \\)
answer
\\( \frac { 64 } { 80 } \\)
\\( \frac { 64 } { 48 } \\)
\\( \frac { 48 } { 80 } \\)
\\( \frac { 48 } { 64 } \\)

Explanation:

Step1: Recall the cosine formula

In a right - triangle, $\cos\theta=\frac{\text{adjacent}}{\text{hypotenuse}}$. For angle $B$, the adjacent side is $48$ and the hypotenuse is $80$.

Step2: Calculate $\cos B$

Using the formula $\cos B=\frac{48}{80}$.

Answer:

$\frac{48}{80}$