Equidiagonal quadrilateral (Area)

Description

A quadrilateral is a polygon with four sides (or edges) and four vertices or corner. An equidiagonal quadrilateral is a convex quadrilateral whose two diagonals have equal length. The area of an equidiagonal quadrilateral can be expressed in terms of the sides a, b, c, d of the equidiagonal quadrilateral and the distance x between the midpoints of the diagonals.