A square
An equilateral quadrilateral is a rhombus (plural rhombi).
square
No, a square is an equilateral quadrilateral. http://en.wikipedia.org/wiki/Quadrilateral
Yes! It's called a rhombus.
A square is an equilateral rectangle or an equiangular rhombus or a regular quadrilateral.
no it is a quadrilateral
A square.
No, equilateral and regular are the same thing.
rhombus
Yes.
A rectangle comes to mind. A rectangle is equiangular (all angles the same) and is also a quadrilateral (four-sided), but is not equilateral (all sides of the same length).
It's not. It's most often called a square but technically speaking it's an equilateral quadrilateral.