A Rhombus
A rectangle or a square.
The quadrilateral you are describing is a parallelogram. In a parallelogram, opposite sides are parallel and equal in length, but it does not necessarily have right angles; the angles can be acute or obtuse. Examples of such parallelograms include rhombuses and non-right-angled rectangles.
A rectangle
Square
Corgent Angles
square
Rhombus!
A square. Its opposite sides are equal and it has 4 right angles.
rhombus
QUADRILATERAL
square
This shape has only one pair of opposite sides and no right angles: <