Question

The Magnitude of Angle ADC is...

Answer 1

Answer:

70°

Step-by-step explanation:

OA=OB (radius of the circle)

therefore OAB=OBA=60°

ABC= 60+50=110

NOW abcd is a cyclic quadrilateral

opposite angles are supplementary

therefore ABC+ADC=180°

110+ADC=180

ADC=180-110

ADC=70°