Difference between Trapezoid and Trapezium

What is the difference between Trapezoid and Trapezium?

Trapezoid as a noun is a (convex) quadrilateral with two (non-adjacent) parallel sides. while Trapezium as a noun is a four-sided polygon with two sides parallel; a trapezoid (modern sense)

Trapezoid

Part of speech: noun

Definition: A (convex) quadrilateral with two (non-adjacent) parallel sides. The trapezoid bone of the wrist. A convex quadrilateral with no sides parallel and no equal sides.

Trapezium

Part of speech: noun

Definition: A four-sided polygon with two sides parallel; a trapezoid (modern sense)A four-sided polygon with no parallel sides and no sides equal; a simple convex irregular quadrilateral.A bone of the carpus at the base of the first metacarpal, or thumb.A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibers.

We hope you now know whether to use Trapezoid or Trapezium in your sentence.

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