NO !!! A triangle consists of three non-parallel lines.
parellel lines
1 pair
Yes.
Not sure about "parellel" but a quadrangle with two pairs of parallel lines MUST be a parallelogram.
None
No
No parallel lines but a right angle triangle has perpendicular lines.
NO !!! A triangle consists of three non-parallel lines.
No.
2
2
parellel lines
1 pair
Parellel lines
Yes.
Not sure about "parellel" but a quadrangle with two pairs of parallel lines MUST be a parallelogram.