There is nothing because if the shape has only four sides and that means two sets that are parallel, the angles will have to be right ones. Unless it's not a polygon that is.
I take it back maybe a parallelogram.
The quadrilateral described is a rectangle. In a rectangle, opposite sides are equal and parallel, and all four angles are right angles. This definition meets the criteria of having one pair of opposite sides that are equal and parallel, along with the presence of right angles.
A rhombus has 4 sides of equal length, opposing parallel sides, and no right angles
A rhombus
a parallogram
A square or maybe a rectangle as well would fit the given description
square
Rectangle
The quadrilateral described is a rectangle. In a rectangle, opposite sides are equal and parallel, and all four angles are right angles. This definition meets the criteria of having one pair of opposite sides that are equal and parallel, along with the presence of right angles.
A parallelogram.
Rhombus
Quadrilaterals
rectangles squares
A rhombus has 4 sides of equal length, opposing parallel sides, and no right angles
A rhombus
A rhombus
a parallogram
It is a square or a rectangle