Question

What is the sum of either pair of opposite angles of a cyclic quadrilateral?

• A. 90°
• B. 180°
• C. 360°
• D. 45°

Answer 1

The correct option is B

180°

The opposite angles of a cyclic quadrilateral are supplementary to each other. Hence the sum of opposite angles in a cyclic quadrilateral is ${180}^{\circ }$.

Here, $\angle 1+\angle 2={180}^{\circ }$