The answer depends on what information you have.
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The mathematician spent all day trying to derive the complex formula.
Area = 0.5*(sum of parallel sides)*height
sa
you divide;work/time=power (/=divided by< I think)
You can visualize the formula for the area - I guess that's what you mean - as multiplying the height by the average width.You can also derive it more formally, by splitting a typical trapezium into rectangles and triangles.