Question

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Answer 1

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Given:~

A cyclic quadrilateral ABCD where O is the center of a circle.

Construction:~

Join the line segment OB and OD. ...

∠BAD + ∠BCD = 180o ...

∠ABC + ∠ADC = 180o

proved:~

Hence proved, that the sum of opposite angles of a cyclic quadrilateral is 180°

Answer 2

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