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parallelogram

Quadrilateral with two pairs of parallel sides

EntityQ45867

Subclass of: parallelogon
, parallelotope
, zonogon
+3 more

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

In Euclidean geometry, a parallelogram is a chiral simple (non-self-intersecting) 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 to the Euclidean parallel postulate or one of its equivalent formulations.

Overview

All data

44 statements · 14% with external sources · numbers in brackets are citations

Has facet polytope: edge quantity: 4
Has characteristic: plane area defining formula: A = bh
Members / parts: vertex quantity: 4
Different from: antiparallelogram

On other databases

34 identifiers linking parallelogram across the web's reference databases

Data quality

statements

14%

externally sourced

Source last edited October 6, 2026. AIDB refreshes this page daily.

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AIDB. (2026). parallelogram (Q45867). Retrieved from https://aidb.si/e/parallelogram-Q45867