Question

the best of opposite angles of equality the best of opposite angles of a cyclic quadrilateral supplementary ​

Answer 1

Sum of measures of all angles of cyclic quadrilateral is 360°

Let Quadrilateral PQRS is a cyclic quadrilateral

Angle P + angle Q + angle R + angle S = 360°

angle P + angle R = 180° - ( By theorem of cyclic quadrilateral )

Hence Proved.