A 4-sided flat shape with straight sides that has a pair of opposite sides parallel.
(Called a trapezium in the UK. Both US and UK definitions of trapezium and trapezoid are swapped over.)
The sides that are parallel are called "bases". The other sides are "legs" (which may or may not be parallel).
(Called a trapezium in the UK. Both US and UK definitions of trapezium and trapezoid are swapped over.)
The sides that are parallel are called "bases". The other sides are "legs" (which may or may not be parallel).
See: Trapezium