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Keywords: Orthodiagonal quadrilateral.svg orthodiagonal quadrilateral a quadrilateral whose diagonals cross at right angles According to a standard characterization of these quadrilaterals the two red squares on opposite sides of the quadrilateral have the same total area as the two blue squares on the other pair of opposite sides own David Eppstein 2011-10-16 Cc-zero Tetragons Area Files by User David Eppstein from en wikipedia |