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What (who) is quadrilateral space of Marie - definition
AXILLARY SPACE IN THE ARM
Quadrangular Space; Quadrilateral space; Quadrangular spaces
Saccheri quadrilateral
QUADRILATERAL WITH TWO EQUAL SIDES PERPENDICULAR TO THE BASE
Khayyam-Saccheri quadrilateral; Saccheri Quadrilateral; Khayyam–Saccheri quadrilateral; Khayyam quadrilateral
A Saccheri quadrilateral (also known as a Khayyam–Saccheri quadrilateral) is a quadrilateral with two equal sides perpendicular to the base. It is named after Giovanni Gerolamo Saccheri, who used it extensively in his book Euclides ab omni naevo vindicatus (literally Euclid Freed of Every Flaw) first published in 1733, an attempt to prove the parallel postulate using the method Reductio ad absurdum.
Ex-tangential quadrilateral
CONVEX QUADRILATERAL WHERE THE EXTENSIONS OF ALL FOUR SIDES ARE TANGENT TO A CIRCLE OUTSIDE IT
Extangential quadrilateral
In Euclidean geometry, an ex-tangential quadrilateral is a convex quadrilateral where the extensions of all four sides are tangent to a circle outside the quadrilateral.Radic, Mirko; Kaliman, Zoran and Kadum, Vladimir, "A condition that a tangential quadrilateral is also a chordal one", Mathematical Communications, 12 (2007) pp.
Quadrilateral
![The (red) side edges of [[tetragonal disphenoid]] represent a regular zig-zag skew quadrilateral](https://commons.wikimedia.org/wiki/Special:FilePath/Disphenoid tetrahedron.png?width=200 "The (red) side edges of [[tetragonal disphenoid]] represent a regular zig-zag skew quadrilateral")
![[[Euler diagram]] of some types of simple quadrilaterals. (UK) denotes British English and (US) denotes American English.](https://commons.wikimedia.org/wiki/Special:FilePath/Euler diagram of quadrilateral types.svg?width=200 "[[Euler diagram]] of some types of simple quadrilaterals. (UK) denotes British English and (US) denotes American English.")
![A taxonomy of quadrilaterals, using a [[Hasse diagram]].](https://commons.wikimedia.org/wiki/Special:FilePath/Quadrilateral hierarchy svg.svg?width=200 "A taxonomy of quadrilaterals, using a [[Hasse diagram]].")
POLYGON WITH FOUR SIDES
Tetragon; Quadrilaterals; Quadrialateral; Quadrilateralness; 4-gon; Crossed-quadrilateral; Butterfly-quadrilateral; Bowtie-quadrilateral; Cross quadrilateral; Cross-quadrilateral; Quadragon; Irregular quadrilateral; Maltitude; Crossed quadrilateral; Bimedian; Skew quadrilateral; Concave quadrilateral; Quadrilater
·adj Having four sides, and consequently four angles; quadrangular.
II. Quadrilateral ·noun A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.
III. Quadrilateral ·noun An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.
Wikipedia
Quadrangular space
The quadrangular space, also known as the quadrilateral space [of Velpeau] and the foramen humerotricipitale, is one of the three spaces in the axillary space. The other two spaces are: triangular space and triangular interval.
