Not sure about "parellel" but a quadrangle with two pairs of parallel lines MUST be a parallelogram.
A parallelogram.
A parallelogram.
1 pair
I do not believe that such a quadrangle can exist in Euclidean space.
NoneOctagon hasn't got any pairs of parallel line
How do you draw a quadrangle with no parellel sides?
A Square.
2
It is a parallelogram.
A parallelogram.
A parallelogram.
1 pair
I do not believe that such a quadrangle can exist in Euclidean space.
It has 2 pairs of equal opposite parallel sides
NoneOctagon hasn't got any pairs of parallel line
A parallelogram.
Actually, a rhombus has two pairs of parallel sides.