Name: SAT Math Help & School Math Mastery
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#15343

equations

formulas

medium

45 sec

The formula for the area of a trapezoid is $A = \frac{1}{2} h (b_{1} + b_{2})$ , where $A$ is the area, $h$ is the height, and $b_{1}$ and $b_{2}$ are the lengths of the two bases. Which of the following correctly expresses the length of base $b_{1}$ in terms of $A$ , $h$ , and $b_{2}$ ?

A.

$b_{1} = \frac{2 A}{h} - b_{2}$

B.

$b_{1} = \frac{2 A - b _{2}}{h}$

C.

$b_{1} = 2 A - h - b_{2}$

D.

$b_{1} = \frac{A}{2 h} - b_{2}$