Answer
$b = \frac{2A}{h}-a$
Work Step by Step
Area of a trapezoid (A) = $\frac{(a+b)h}{2}$
2A = (a+b)h
2A/h = a+ b
$b = \frac{2A}{h}-a$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.