If it only has 2 parallel sides, then it is a trapezoid (called a trapezium outside of North America).
If it has 2 pairs of parallel sides, then it is a parallelogram.
A trapezoid is a shape that has 4 sides and 2 parallel sides. The sides that are parallel are called the bases.
The four sided shape that has two parallel lines is called a trapezoid. A parallelogram is a four sided shape that has two pairs of parallel lines.
An irregular quadilateral has no 2 parallel sides . A trapezium has a par of parallel sides , which means that it HAS two parallel sides.
Parrallelagram
A trapezium.
trapezium
Trapezoid
Square
oclallagon
a trapezium
Rectangle
it can but doesn't have to.