Question

solve this question please

Answer 1

ABCD is a cyclic quadrilateral
90 + x =180(sum of opp. angle of a cyclic quadrilateral)

x= 90 degree

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Answer 2

ABCD is a cyclic quadrilateral

so

angle CBA=90 degree

angle CBA+CDA=180 degree

90+CDA=180

CDA=180-90

CDA=90 degree