# Definition:Diameter of Quadrilateral

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## Definition

Let $ABCD$ be a quadrilateral:

The **diameters** of $ABCD$ are the lines $AC$ and $BD$ joining their opposite vertices.

## Also known as

The **diameters** of a quadrilateral are also commonly known as its **diagonals**.

## Also see

Note the difference between this definition and that of the diameter of a general geometric figure.

In the latter, the diameter is specifically the *longest* dimension of the figure.