Lambert quadrilateral

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A Lambert quadrilateral
A Lambert quadrilateral

A Lambert quadrilateral is a four sided figure. It can only exist in non-Euclidean geometry. It has a base, AB, two unequal 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 an acute angle. It is composed entirely of straight lines.

With perspective
With perspective

The Lambert quadrilateral was realized while Johann Lambert was studying Saccheri quadrilaterals.

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