Rectangle is the exact answer. But if you want to be technical, a square could also be the answer.
Rhombus
rhombus
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
It depends on the actual shape of that octagon. It CAN have two pairs of parallel sides. A regular octagon has 4 pairs of parallel sides.
A rectangle
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
Square