If the degree measure of the sum of any two opposite angles of a quadrilateral is `…………..` ,then it is a cyclic quadrilateral.

Sum of opposite angles in a cyclic quadrilateral is …………

If the sum of any pair of opposite angles of a quadrilateral is 180^@ ; then the quadrilateral is cyclic.

The opposite angles of a cyclic quadrilateral are ……………

If the sum of any pair of opposite angles of a quadrilateral is 180^(@) ; then the quadrilateral is cyclic.

If the sum of the pairs of opposite angles of a quadrilateral is 180^@ , then the quadrilateral is

What is the sum of the measures of the angles of a quadrilateral?

Theorem 10.12 : If the sum of a pair of opposite angles of a quadrilateral is 180º, the quadrilateral is cyclic.

The sum of either pair of opposite angles of a cyclic quadrilateral is 180^0 OR The opposite angles of a cyclic quadrilateral are supplementary.

Prove that the sum of opposite pair of angles of a cyclic quadrilateral is 180^@