A square
Step-by-step explanation:
A rhombus is a four shaped figure. Its four sides are equal in length.
Its opposite sides are parallel and opposite angles are equal.
Its diagonals bisect each other at angle 90 degrees.
A square has all four sides equal. Its angles at each edge is equal to 90 degrees.
Hence, it has four right angles. Since all four sides are equal, its opposite sides will be equal.
Hence, a figure that has four sides and four right angles and its opposite sides are equal is a square