Question

Find the angle of arc BC

Answer 1

96°

Explanation:

The measure of arc EC is twice the measure of ∠DEC, so is ...

arc EC = 2×68° = 136°

The measure of arc BC is found from the sum of arcs around a circle.

BC +CE +EB = 360° = BC +136° +128°

BC = 96° . . . . . subtract 264°