A Rhombus
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Rectangle, parallelogram
It is a rhombus
A rectangle and a parallelogram have the same formula for area:The area of a parallelogram is given:area = length × widthwhere:length is the length of one of the sides of the parallelogram; andwidth is the perpendicular distance between the side chosen for the length and its parallel side.In the formula for the area of a rectangle, the width (perpendicular distance between the sides given for the length) is also the length of the other two sides.
That would be a rhombus. (It can't be a 'square', because a square is also a rectangle.)
If both pairs of opposite sides are the same length, and both pairs of opposite angles are the same, the quadrilateral is a parallelogram (rhombus, rectangle, or square).