# Definition:Quadrilateral/Parallelogram/Base

< Definition:Quadrilateral | Parallelogram(Redirected from Definition:Base of Parallelogram)

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## Definition

In a given parallelogram, one of the sides is distinguished as being the **base**.

It is immaterial which is so chosen, but usual practice is that it is one of the two longer sides.

In the parallelogram above, line $AB$ is considered to be the **base**.