**Trapezoid - Wikipedia**
https://en.wikipedia.org/wiki/Trapezoid

A quadrilateral with at least one pair of parallel sides is called, in American and Canadian English, a trapezoid . In British and other forms of English, a (North American) trapezoid is called a trapezium (/trəˈpiːziəm/). The transposition of these two terms was a result of an error in Charles Hutton's mathematical dictionary. Area: a, +, b, 2, h, {\displaystyle {\tfrac {a+b}{2}}h} Edges and vertices: 4

**Area:** a, +, b, 2, h, {\displaystyle {\tfrac {a+b}{2}}h}

**Edges and vertices:** 4

**DA:** 24 **PA:** 59 **MOZ Rank:** 14