A square or a diamond.
The latter is properly called a rhombus.
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A square.
a parallelogram who's sides measure the same is called a rhombus :^>
A square.
If the sides of a parallelogram are all of the same length then it is a rhombus. Thus, a rhombus is a special type of parallelogram.
A parallelogram is a quadrilateral with two pairs of parallel sides that are opposite each other and of the same length. A rhombus is a special case of a parallelogram where all four sides are of equal length.