A square if I'm correct
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They are either kites or (if the diagonals bisect each other) rhombuses.
It is a kite or a rhombus both of which have unequal diagonals that are perpendicular to each other creating right angles.
In short, yes. A parallelogram is a quadrilateral with opposite sides parallel (and therefore opposite angles equal). A quadrilateral with equal sides is called a rhombus, and a parallelogram whose angles are all right angles is called a rectangle. And, since a square is a degenerate case of a rectangle, both squares and rectangles are special types of parallelograms.
Two angles the sum of whose measures is 90 degrees are complimentary angles.
rectangle