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 ...

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

Is this parallelogram a **trapezoid** according to your **definition**? Explain. ... The
parallelogram **does** not fit the "one and only one" version of the **definition**. So how
...