Question

Abcd is a cyclic trapezium in which ab || dc and ab is the diameter of the circle. If cab = 30, then what will be adc?

Answer 1

angle BDC= 30 (ANGLE IN THE SAME SEGMENT)

AB IS THE DIAMETER.

ANGLE ADB=90 (ANGLE IN THE SEMI CIRCLE)

ANGLE ADC= ANGLE ADB+ANGLE BDC

ANGLE ADC = 90+30 = 120

SO,

ADC= 120 DEGREES