In geometry, a Lambert quadrilateral, also Ibn al-Haytham–Lambert quadrilateral,[1] named after Ibn al-Haytham and Johann Heinrich Lambert, is a quadrilateral. It has a base, AB, two legs standing at right angles to it, AC and BD, and the summit, CD, meets one of the two legs at a right angle and the other leg at a non-obtuse angle.
See also
Notes
- ^ 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
- M. J. Greenberg, Euclidean and Non-Euclidean Geometries: Development and History, 4th edition, W. H. Freeman, 2008.
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