CPM Homework Help : CCG Problem 11-120

2 intersecting chords divide circle's circumference into 4 arcs, labeled as follows: left, x, right, 21 degrees. Angle on left side of intersection, labeled, 62 degrees. Copy the diagram at right onto your paper. Use the process from problem 11-111 to find the measure of $x$ . Show all work.

Hint:

In problem 11-111, it was established that the vertical angles are equal to the average of the two arcs.

Therefore $\frac{x+21°}{2}=62°$