The correct formula is
A=(1/2)h(B+b)
B and b are the lengths of the two parallel sides and h is the distance beween them
Now... what exactly is your question?
If you want to solve for b, that can be done as follows:
B+b = (2A/h)
b = (2A/h) -B
A=1/2h(B=b) (for b)area of a trapezoid
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