A square.
no it is a quadrilateral
No, equilateral and regular are the same thing.
rhombus
A square or a rhombus perhaps?
A rhombus
No, a square is an equilateral quadrilateral. http://en.wikipedia.org/wiki/Quadrilateral
An equilateral quadrilateral is a rhombus (plural rhombi).
no it is a quadrilateral
No, equilateral and regular are the same thing.
A square
rhombus
Yes.
A rectangle
square
A square or a rhombus perhaps?
quadrilateral, equilateral
It is a rhombus