Question

If the sum of a pair of opposite angles of a quadrilateral is ${180}^{\circ }$, then the quadrilateral is

• A. Parabolic
• B. Cyclic
• C. Both cyclic and parabolic
• D. Can't say

Answer 1

The correct option is B

Cyclic

A quadrilateral is called cyclic if all the four vertices of it lie on a circle and the sum of either pair of opposite angles of a cyclic quadrilateral is ${180}^{\circ }$.

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