Its diagonals are congruent. One set of parallel sides. The other two non parallel lines are congruent.
A trapazoid
Trapazoid
Trapazoid
A parallelogram must have two pairs of parallel sides. A trapezium has only one such pair.
A parallelogram has two pairs of parallel sides, whereas a trapezoid has only one pair.
A parallelogram has two pairs of parallel sides, a trapezoid has only one.
A trapezoid has one pair of parallel sides. All other quadrilaterals have no parallel sides or two pairs of parallel sides.
One side cannot be parallel because parallel is a relationship between two lines (or sides). A square has two pairs of parallel lines.
Two lines are coplanar iff they are parallel OR intersect.
When two lines are parallel, then they do not intersect.
since one parallel lines is perpendicular to another line, the other parallel line is perpendicular to the line as well. so the two would not be parallel, only the original two.