# Definition:Polygon/Chord

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## Definition

A **chord** of a polygon $P$ is a straight line connecting two non-adjacent vertices of $P$:

In the above diagram, $DF$ is a **chord** of polygon $ABCDEFG$.

## Also known as

A **chord** of a polygon is also known as a **diagonal**.

## Also defined as

Some texts require that a **chord** of a polygon $P$ should lie completely in the interior of $P$.

## Also see

- Results about
**chords of polygons**can be found**here**.

## Sources

- 1998: David Nelson:
*The Penguin Dictionary of Mathematics*(2nd ed.) ... (previous) ... (next):**diagonal**:**1.** - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next):**diagonal**:**1.**