Question 659
The formula for the area of a triangle is:
{{{A = (1/2)*h*b}}}
 
Take the information you have in the problem, and substitute.
A = 54
b = 12
 
So, the problem looks like this:
{{{54 = (1/2) * h * 12}}}
 
Simplify the right hand side of the equation by multiplying 1/2 and 12.
{{{54 = 6 * h}}}
 
Then divide both sides by 6, since division is the opposite of multiplication.
{{{9 = h}}}
 
So, the height is 9 inches.