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Geometry/Quadrilaterals (2)
In Euclidean plane geometry, a quadrilateral is a polygon with four edges (or sides) and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on. The origin of the word "quadrilateral" is the two Latin words quadri, a variant of four, and latus, meaning "side". Quadrilaterals are simple (not self-intersecting) or complex (self-intersecting), also called crossed. Simple quadrilaterals are either convex or concave. The interior angles of a simple (and planar) quadrilateral ABCD add up to 360 degrees of arc, that is {\displaystyle \angle A+\angle B+\angle C+\angle D=360^{\circ }.} \angle A+\angle B+\angle C+\angle D=360^{\circ }. This is a special case of the n-gon interior angle sum formula (n - 2)
Last Updated: 5th Aug 2016
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