Lambert quadrilateral

Lambert quadrilateral

A Lambert quadrilateral, or Ibn al-Haytham–Lambert quadrilateral, [Boris Abramovich Rozenfelʹd (1988), "A History of Non-Euclidean Geometry: Evolution of the Concept of a Geometric Space", p. 65. Springer, ISBN 0387964584.] is a hyperbolic 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.

Notes

References

*George E. Martin, "The Foundations of Geometry and the Non-Euclidean Plane", Springer-Verlag, 1975


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