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The answer depends on what x is. And also, it is a trapezoid, not trapizoid!
Area of a trapezoid = (1/2) x (height) x (length of the base + length of the top)
A trapezoid is a polygon. Therefore, a trapezoid has no height
We will take the height as unknown, so Unknown = X Area = 1/2 x X x (12 + 19) X = A/31 And there you have it. :D.
The bases of a trapezoid are either of its parallel sides.