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What are the rules for a quadrilateral to be cyclic ?
(i) A quadrilateral is said to be a cyclic quadrilateral if there is a circle passing through all its four vertices.

(ii) Sum of opposite angles of a cyclic quadrilateral is 180 degree.

(iii) The product of lengths of the two diagonals of a cyclic quadrilateral is equal to the sum of the products of opposite sides.


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