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A right trapezium. A right trapezium. A right trapezium. A right trapezium.
a trapezium
A trapezium is a shape with four sides. Of these, one pair of sides are parallel. The only restriction on the other pair is that they are not parallel (because you then have a parallelogram).
A trapezium is a quadrilateral (a shape with four sides) with two of its sides parallel. It is not spelt trapezuim, but rather trapezium. Trapezium is another name for trapezoid.
The most famous is a stop sign.