Answer:
Step-by-step explanation:
You already know the formula for area of a triangle, so we will write it down and then fill it in with the info given.
[tex]A=\frac{1}{2}bh[/tex] and filling in:
[tex]54=\frac{1}{2}b(12)[/tex] and we can simplify that a bit by dividing 12 by 2 on the right side to get:
54 = 6b and dividing:
b = 9 inches
