Answer:
m< B = 120°
Step-by-step explanation:
The sum of the angles of a trapezoids 360°
m<c=m<D= 60°
60°+60°+2x=360°
120°+2x=360°
2x=360°–120°
2x=240°
x=240/2
x=120°
So : m<B =120°
5.3m questions
6.9m answers