quadrilateral - Polygon with 4 edges/sides and 4 corners/vertices
Free Bretschneiders Formula Calculator - Calculates the area of a quadrilateral using Bretschneiders Formula
Free Quadrilateral Calculator - Given 4 points entered, this determines the area using Brahmaguptas Formula and perimeter of the quadrilateral formed by the points as well as checking to see if the quadrilateral (quadrangle) is a parallelogram.
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