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en.wikipedia.org/wiki/Trapezoid

The former definition would make such concepts as the trapezoidal approximation to a definite integral ill-defined. This article uses the inclusive definition and considers parallelograms as special cases of a trapezoid. This is also advocated in the taxonomy of quadrilaterals. Under the inclusive definition, all parallelograms ...

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 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. Angles

www.mathsisfun.com/geometry/trapezoid.html

Trapezoid. (Jump to Area of a Trapezoid or Perimeter of a Trapezoid). A trapezoid is a 4-sided flat shape with straight sides that has a pair of opposite sides parallel (marked with arrows below): ...

www.dictionary.com/browse/trapezoid

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

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 sides that are also known as the bases of the figure. To find the area of a trapezoid, take the average of the bases and multiply it by the height. In anatomy, the ...

www.merriam-webster.com/dictionary/trapezoid

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'trapezoid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

www.math.washington.edu/~king/coursedir/m444a00/syl/class/trapezoids/Trapezoids.html

Trapezoids. Definition of Trapezoid. Believe it or not, there is no general agreement on the definition of a trapezoid. In B&B and the handout from Jacobs you got the Exclusive Definition. Exclusive Definition of Trapezoid. A quadrilateral having two and only two sides parallel is called a trapezoid. However, most ...

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, the equivalent term is trapezium.) The parallel sides may be vertical , horizontal , or slanting . In fact, by the definition, even this Image:ParallelogramSmallGray. png ...

www.illustrativemathematics.org/content-standards/tasks/1504

The parallelogram fits the "at least one" version of the definition because it has two pairs of opposite sides parallel, therefore it falls into the category of being both a trapezoid and a parallelogram. The parallelogram does not fit the "one and only one" version of the definition. So how students answer this depends on their ...