What's the best way to solve this equation

Question

If m∠ADC = 164° and  is the angle bisector of ∠ADC, find

m∠BDC.

	A)	328°
B)	100°
C)	82°
D)	164°

Answer 1

The angle bisector is half the angle that is being bisected. Therefore, the angle bisector here is (1/2)(164°) which is 82°. So, "C" is the correct answer.

Hope this helps!