What is m ∠DEC if measure of Arc DC = 150° and measure of Arc AB = 90°?A. 150°B. 120°C. 240°D. 90°
Accepted Solution
A:
we know that Inner angle, has its center at an inner point of the circle. The measure of the interior angle is the half-summit of the arcs that comprise it and its opposite. so m ∠DEC=[Arc DC+Arc AB]/2------> [150+90]/2-----> 120°