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Quadrilateral
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==Taxonomy== [[File:Quadrilateral hierarchy svg.svg|thumb|A taxonomy of quadrilaterals, using a [[Hasse diagram]].]] A hierarchical [[Taxonomy (general)|taxonomy]] of quadrilaterals is illustrated by the figure to the right. Lower classes are special cases of higher classes they are connected to. Note that "trapezoid" here is referring to the North American definition (the British equivalent is a trapezium). Inclusive definitions are used throughout.
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