Equilateral means all of the sides are equal and quadrilateral means four sided.
This must be a parallelogram; in fact a special case of a parallelogram. If one angle is right then they all must be, and the figure is a square. Otherwise it is a rhombus.
A square.
no it is a quadrilateral
No, equilateral and regular are the same thing.
rhombus
A square or a rhombus perhaps?
No, a square is an equilateral quadrilateral. http://en.wikipedia.org/wiki/Quadrilateral
An equilateral quadrilateral is a rhombus (plural rhombi).
A square.
no it is a quadrilateral
No, equilateral and regular are the same thing.
A square
Yes.
rhombus
A square or a rhombus perhaps?
A rectangle
It is a rhombus
square