02-12-2017
Mathematics

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Which description does NOT guarantee that a quadrilateral is a parallelogram?

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02-12-2017

Well, parallelograms have two sets of parallel sides. Quadrilaterals have four sides so all parallelograms are quadrilaterals but not all quadrilaterals are parallelograms.
Trapezoids have four sides but only one set of parallel lines so this proves the statement.

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