Chapter 8.4, Problem 4BCYP

To determine

The value of angle A.

Answer to Problem 4BCYP

  $\angle A=78.5°$

Explanation of Solution

Given:

  

Calculation:

The value of $\angle A$ will be:

  $\begin{array}{l}\cos A=\frac{B}{H}\\ \angle A={\cos }^{-1}\left(\frac{3}{15}\right)\\ \angle A={\cos }^{-1}\left(0.2\right)\\ \angle A=78.5°\end{array}$