rhombus
a parallelogram
A rhombus.
Rhombus
trapazoid
rectangle
A square.
rhombus
parallelogram
A parallelogram has both pairs of opposite sides parallel but no right angles. A special kind of parallelogram is a rhombus which has all its sides of equal length
a square
Rectangle is the exact answer. But if you want to be technical, a square could also be the answer.
Square