Chapter 75, Problem 19A

In each of the following exercises, the top, front, and right side views of a compound-angular surface are shown. Compute the required angles using these formulas:

$\tan \angle R=\frac{\tan \angle B}{\tan \angle A}$

$\tan \angle T=\frac{\tan \angle A}{\cos \angle R}$

Given: $\angle B=18°00\text{'}$

$\angle R=22°00\text{'}$

a. Compute $\angle A.$

b. Compute $\angle T.$

Use this figure for Exercises 18, 19, and 20.