# Definition:Quadrilateral/Rhomboid

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## Definition

A **rhomboid** is a parallelogram whose sides are *not* all the same length.

Its angles *may or may not* all be equal.

## Also see

- Oblong: a
**rhomboid**all of whose angles are equal to a right angle.

## Euclid's Definitions

In the words of Euclid:

*Of quadrilateral figures, a***square**is that which is both equilateral and right-angled; an**oblong**that which is right-angled but not equilateral; a**rhombus**that which is equilateral but not right-angled; and a**rhomboid**that which has its opposite sides equal to one another but is neither equilateral nor right-angled. And let quadrilaterals other than these be called**trapezia**.