# Definition:Quadrilateral/Parallelogram/Altitude

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## Definition

An **altitude** of a parallelogram is a line drawn perpendicular to its base, through one of its vertices to the side opposite to the base (which is extended if necessary).

In the parallelogram above, line $DE$ is an **altitude** of the parallelogram $ABCD$.

The term is also used for the length of such a line.

## Also known as

The length of the **altitude** of a parallelogram is also known as its **height**, but as this term is less precise it is not recommended.