Question

please solve this question very urgent​

Answer 1

Explanation:

Angle BDC = 90 degrees (Angle in a semi circle )

Angle ABD = 180-(80+90)

= 10

Angle ADC = {180-(10+20)}. (Opposite angles in a cyclic quadrilateral are supplementary)

=150

Angle BDC = Angle ADC - Angle ADB

=150-90

= 60

All the numerical values will be in degrees.

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