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In euclidian geometry a cyclic quadrilateral  or iniscribed quadrilateral is a quadrilateral whose vertices all lie on a single circle . this circle is called circumcircle or circumscribed circle and the vertices are said to be cyclonic.
the formula to calculate area of  cyclic quadrilateral is :-
A =  (s-a) (s-b)(s-c)(s-d) in underoot.
hope this makes u understand.

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