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en.wikipedia.org/wiki/Trapezoid

In Euclidean geometry, a convex quadrilateral with at least one pair of parallel sides is referred ... The former definition would make such concepts as the trapezoidal approximation to a definite integral ill-defined. This article ... 25; The cosines of two adjacent angles sum to 0, as do the cosines of the other two angles. :p.

www.mathsisfun.com/definitions/trapezoid.html

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 ...

www.dictionary.com/browse/trapezoid

Trapezoid definition, a quadrilateral plane figure having two parallel and two nonparallel sides. See more.

www.merriam-webster.com/dictionary/trapezoid

Define trapezoid: a quadrilateral having only two sides parallel; trapezium; ... in the examples do not represent the opinion of Merriam-Webster or its editors.

www.vocabulary.com/dictionary/trapezoid

The word trapezoid comes from the Greek trapeza meaning "table" and -oeides meaning "shaped." Think of a trapezoid as table-shaped. It has a pair of parallel ...

thinkmath.edc.org/resource/shape-trapezoid

Meaning. A trapezoid is a quadrilateral with at least one pair of parallel sides. No other features matter. (In English-speaking countries outside of North America, ...

www.mathopenref.com/trapezoid.html

Trapezoid (USA definition). From Greek: trapeze, -oid -"like". A quadrilateral which has at least one pair of parallel sides (but see definition notes below). Try this ...