Measure of Angle

Arc BC 2 X 60 degrees = 120 degrees

m

m
Angle is 1/2 of Arc therefore 120 degrees Arc's 1/2 is 60 degrees in angle.

measure of Arc EBA = BE - CE = 180 - 40 divide by 2 = 140/2 = 70 degrees.

4) In circle O, FA is a tangent, FEDB is a secant, ADC and AB are chords, mCE = 40D, mAB = 130D, and mACAB = 60D.

Find:
(a) mBC
(b) mAEBA
(c) mAADE
(d) mAF
(e) mAFAC