Let us Assume A Cyclic Quadrilateral (convex) Whose Circumcentre Is O At The Origin .The Plane x-y Being A Complex Plane .The Four Vertices Of The Quadrilateral Are Taken In an Order.This Quadrilateral is Rotated An Angle x about O (anticlockwise). To Form Another Quadrilateral.

Find The Area Common between the Two quadrilaterals.