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 ...