In the given cyclic quadrilateral ABCD, ∠A = 120° and ∠D = 60°, then what is the difference of the measure of angles B and C?
1
60°
2
50°
3
70°
4
40°
In the given cyclic quadrilateral ABCD, ∠A = 120° and ∠D = 60°, then what is the difference of the measure of angles B and C?