Lambert quadrilateral

A Lambert quadrilateral

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 is famous as an early exploration into non-Euclidean geometry. 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

  1. ^ Boris Abramovich Rozenfelʹd (1988), A History of Non-Euclidean Geometry: Evolution of the Concept of a Geometric Space, p. 65. Springer, ISBN 0387964584 [Amazon-US | Amazon-UK].

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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