The area of a triangle is given by:
[tex]A=\frac{b\cdot h}{2}[/tex]Where:
b = base
h = height = 8.2
A = Area = 12
Therefore:
[tex]\begin{gathered} b=\frac{2A}{h} \\ b=\frac{2(12)}{8.2} \\ b=2.9268in \\ b\approx3in \end{gathered}[/tex]Answer:
A) 3 inches