Trapezoid
| Trapezoid (American English) Trapezium (British English) | |
|---|---|
Trapezoid or trapezium | |
| Type | quadrilateral |
| Edges and vertices | 4 |
| Area | |
| Properties | convex |
Look up trapezoid in Wiktionary, the free dictionary.
In geometry, a trapezoid (/ˈtræpəzɔɪd/) in North American English, or trapezium (/trəˈpiːziəm/) in British English,[1][2] is a quadrilateral that has at least one pair of parallel sides.
The parallel sides are called the bases of the trapezoid.[3] The other two sides are called the legs[3] or lateral sides. If the trapezoid is a parallelogram, then the choice of bases and legs is arbitrary.
A trapezoid is usually considered to be a convex quadrilateral in Euclidean geometry, but there are also crossed cases. If shape ABCD is a convex trapezoid, then ABDC is a crossed trapezoid. The metric formulas in this article apply in convex trapezoids.
- ^ "Trapezoid – math word definition – Math Open Reference". www.mathopenref.com. Retrieved 2024-05-15.
- ^ Gardiner, Anthony D.; Bradley, Christopher J. (2005). Plane Euclidean Geometry: Theory and Problems. United Kingdom Mathematics Trust. p. 34. ISBN 9780953682362.
- ^ a b Hopkins 1891, p. 33.