A Saccheri Quadrilateral A Saccheri quadrilateral, or Khayyam-Saccheri quadrilateral,[1] is a four-sided figure. It has a base, AB, two equal legs standing at right angles to it, AC and BD, and non-obtuse angles at the summit, CD. It is composed entirely of straight lines. It was discovered by Omar Khayyam and is named after Giovanni Gerolamo Saccheri.[1] A rectangle is a special case of a Saccheri quadrilateral in which all four angles are right angles. A Saccheri quadrilateral is composed of two equal Lambert quadrilaterals. Notes 1. ^ a b Boris Abramovich Rozenfelʹd (1988), A History of Non-Euclidean Geometry: Evolution of the Concept of a Geometric Space, p. 65. Springer, ISBN 0387964584. References * George E. Martin, The Foundations of Geometry and the Non-Euclidean Plane, Springer-Verlag, 1975 Retrieved from "http://en.wikipedia.org/"
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