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A self-intersecting quadrilateral is called variously a cross-quadrilateral, crossed quadrilateral, butterfly quadrilateral or bow-tie quadrilateral. In a crossed quadrilateral, the four "interior" angles on either side of the crossing (two acute and two reflex , all on the left or all on the right as the figure is traced out) add up to 720°.
Pages in category "Types of quadrilaterals" The following 29 pages are in this category, out of 29 total. This list may not reflect recent changes. A. Ailles rectangle;
Types of quadrilaterals (29 P) Pages in category "Quadrilaterals" The following 9 pages are in this category, out of 9 total.
The ancient Greek mathematician Euclid defined five types of quadrilateral, of which four had two sets of parallel sides (known in English as square, rectangle, rhombus and rhomboid) and the last did not have two sets of parallel sides – a τραπέζια (trapezia [9] literally 'table', itself from τετράς (tetrás) 'four' + πέζα ...
It divides the quadrilateral into two congruent triangles that are mirror images of each other. [7] One diagonal bisects both of the angles at its two ends. [7] Kite quadrilaterals are named for the wind-blown, flying kites, which often have this shape [10] [11] and which are in turn named for a hovering bird and the sound it makes.
The Apollonian quadrilaterals are important in inversive geometry, because the property of being an Apollonian quadrilateral is preserved by Möbius transformations, and every continuous transformation of the plane that preserves all Apollonian quadrilaterals must be a Möbius transformation. [1] Every kite is an Apollonian quadrilateral.
A quadrilateral (a four-sided polygon in the Euclidean plane) is a square if and only if it is any one of the following: . A rectangle with four equal sides [1]; A rhombus with a right angle between a pair of adjacent sides [1]
A Saccheri quadrilateral is a quadrilateral with two sides of equal length, both perpendicular to a side called the base. The other two angles of a Saccheri quadrilateral are called the summit angles and they have equal measure. The summit angles of a Saccheri quadrilateral are acute if the geometry is hyperbolic, right angles if the geometry ...