A trapezoid has one height: vertical measurement from top to bottom, and two bases: horizontal measurement on top and horizontal measurement on bottom. To find the area, you add the two bases together, multiply that by the height, and then divide by 2.
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Area = 0.5*(sum of parallel sides)*height
Area in square units = 0.5*(sum of parallel sides)*height
Area = (1/2) x (height) x (length of lower base + length of upper base)
There is no simple formula and, in any case, the answer will depend on what information about the trapezoid is given.
Area = Base * Height so Base = Area/Height