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# Finding a Base of a Trapezoid

SATMAT-XEJQJF

The area of a trapezoid is given by the formula $A=\frac { 1 }{ 2 } h({ b }_{ 1 }+{ b }_{ 2 })$, where $h$ is the height and ${ b }_{ 1 }$ and ${ b }_{ 2 }$ are the two bases.

If one of the bases is $4$ units long, then what is a correct formula for the other base?

A

$b=2A-4$

B

$b=2Ah-4h$

C

$b=\cfrac { 2A-4h }{ h }$

D

$b=\cfrac { 1 }{ 2 } hA-4$