Question

If m/ABC = 50°, what is mZADC?
B
A
C

Answer 1

∠ ADC = 130°

Explanation:

ABCD is a cyclic quadrilateral, its vertices lie on the circle.

the opposite angle sum to 180° , that is

∠ ABC + ∠ ADC = 180°

50° + ∠ ADC = 180° ( subtract 50° from both sides )

∠ ADC = 130°