Question

score: 3/10 current time: 78.9 find: cos b the figure is not drawn to scale answer $\frac{21}{75}$ $\frac{72}{21}$ $\frac{21}{72}$ $\frac{72}{75}$

Explanation:

Step1: Recall cosine ratio formula

In a right - triangle, $\cos\theta=\frac{\text{adjacent}}{\text{hypotenuse}}$. For angle $B$, the adjacent side to angle $B$ is $21$ and the hypotenuse is $75$.

Step2: Calculate $\cos B$

$\cos B=\frac{21}{75}$

Answer:

$\frac{21}{75}$