Question

Question 8 circle theorems PLEASE

Answer 1

Opposite angles of a cyclic quadrilateral add to 180°

Angel CBA and angle ADC adds up to 180°.

CBA + ADC = 180

CBA = 180 - ADC

x + CBA = 180

x + 180 - ADC = 180

x - ADC = 0

x = ADC

y + ADC = 180

y + x = 180