Definition:Quadrilateral/Rhomboid

From ProofWiki
Jump to navigation Jump to search

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


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.

(The Elements: Book $\text{I}$: Definition $22$)