High Quality Content by WIKIPEDIA articles! A Saccheri quadrilateral is a quadrilateral with two equal sides perpendicular to the base. It is named after Giovanni Gerolamo Saccheri, who used it extensively in his book Euclid vindicatus (1733), an attempt to prove the parallel postulate using the method Reductio ad absurdum. Since the Saccheri quadrilateral was first considered by Omar Khayyam in the late 11th century, the quadrilateral has alternatively been named the Khayyam-Saccheri quadrilateral.

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