Chapter 76, Problem 11A

In each of Exercises 11 through 14, three views of a part are shown. Two surfaces are to be machined in reference to the horizontal plane at the angles shown in the front and right side views. Do not use intersecting angular surface formulas in solving these exercises. For each exercise:
a. Sketch and label a rectangular solid and the pyramid formed by the angular surface edges. Show the right triangle that contains $\angle C$ and the right triangles that contain the given angles and $\angle R$ . Identify $\angle C$ , $\angle R$ , and the given angles.

b. Compute $\angle R$ .
c. Compute $\angle C$ .

a. (sketch)