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.
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no it is a quadrilateral
A square.
No, equilateral and regular are the same thing.
rhombus
A square or a rhombus perhaps?