To solve for \( h \) in the formula for the area of a trapezoid, \( A = \frac{1}{2} h (b_1 + b_2) \), we can rearrange the equation as follows:
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Multiply both sides by 2 to eliminate the fraction: \[ 2A = h(b_1 + b_2) \]
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Next, divide both sides by \( (b_1 + b_2) \) to isolate \( h \): \[ h = \frac{2A}{b_1 + b_2} \]
So the correct answer is:
h = 2A / (b1 + b2)