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What is the definition of a trapezoid?

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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). See: Trapezium. read more

Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents. read more

Some define a trapezoid as a quadrilateral having only one pair of parallel sides (the exclusive definition), thereby excluding parallelograms. Others define a trapezoid as a quadrilateral with at least one pair of parallel sides (the inclusive definition), making the parallelogram a special type of trapezoid. read more

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