- A trapezium (trapezoid) is a parallelogram which has one pair of parallel edges.
- The parallel edges are called bases, those not parallel are legs.
- The diagonals neither halve one another nor are perpendicular to one another.
- The height is the perpendicular distance between the bases.

- P – perimeter
- A – area
- a,c – bases

- b,d – legs
- h – height

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