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Theorem 10.11 : The sum of either pair o...

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

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

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Theorem 6.7 : The sum of the angles of a triangle is 180º