# Definition:Polygon/Opposite

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## Definition

When a polygon has an even number of sides, each side has an **opposite side**, and each vertex likewise has an **opposite vertex**.

When a polygon has an odd number of sides, each side has an **opposite vertex**.

The **opposite side** (or **opposite vertex**) to a given side (or **vertex**) is that side (or vertex) which has the same number of sides between it and the side (or vertex) in question.

## Also known as

In the same way that vertices can be called **angles**, an **opposite vertex** is often referred to as an **opposite angle**.