Prove that any exterior angle of a cyclic quadrilateral is equal to the interior angle at the opposite vertex
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The opposite angles of a cyclic quad are supplementary. ... Adjacent angles on a straight line are supplementary. So x1+x2=180° An exterior angle of any shape is formed by extending a side.
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The opposite angles of a cyclic quad are supplementary. ... Adjacent angles on a straight line are supplementary. So x1+x2=180° An exterior angle of any shape is formed by extending a side.
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