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Prove that the sum of opposite pair of a...

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

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The sum of angles of a concave quadrilateral is

Theorem 10.11 : The sum of either pair of opposite angles of a cyclic quadrilateral is 180º.

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

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