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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.
Area = height * (basisBottom + basisTop)
A = h * (a + b) =
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"Trapezium Area" Math @ STANDS4. STANDS4 LLC, 2018. Web. 15 Aug. 2018. <http://math.stands4.com/calculators/trapezium-area>.