Question

ABCD is a cyclic quadrilateral.if ABC70° ,then ADC is equal to​

Answer 1

AB || DC

The sum of opposite angles in cyclic quadrilateral are supplementary.

Angle ABC = DCB = 70

AB || DC

Angle ABC + ADC = 180

ADC = 180 - 70 = 110 = BAD

BAD = ADC = 110

$\:$

Answer 2

Answer:

$< adc = 110$

Step-by-step explanation:

we know that opposite angles of cyclic quadrilateral is 180°

and hence,

$< adc + < abc = 180$

$< adc + 70 = 180 \\ < adc = 180 - 70 \\ < adc = 110$

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