# Manipulate formulas

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### Problem

The area, A, of a trapezoid is calculated using the formula A, equals, start fraction, 1, divided by, 2, end fraction, left parenthesis, b, plus, c, right parenthesis, h, where h is the height of the trapezoid and b and c are the bases of the trapezoid.
Rearrange the formula to solve for h.
h, equals
What is the height of a trapezoid with one base equal to 20, space, m, the other base equal to 7, space, m, and an area of 135, space, m, start superscript, 2, end superscript ?