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- Dictionaryparallelogram/ˌparəˈlɛləɡram/
noun
- 1. a four-sided plane rectilinear figure with opposite sides parallel.
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noun
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In Euclidean geometry, a parallelogram is a simple quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. The congruence of opposite sides and opposite angles is a direct consequence of the Euclidean parallel postulate and neither condition can be proven without appealing t... Wikipedia