In Euclidean geometry, a convex quadrilateral with at least one pair of parallel sides is referred to as a trapezoid in American and Canadian English but as a trapezium in English outside North America.

Bases of Trapezoid: a,b

Midline: q

Altitude: h

Area: S

- $q={a+b}/2$
- $S={a+b}/2\ h$

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