To rewrite the formula \( A = \frac{bh}{2} \) in terms of \( b \), we need to isolate \( b \).
Starting with the area formula:
\[ A = \frac{bh}{2} \]
Multiply both sides by 2 to eliminate the fraction:
\[ 2A = bh \]
Next, to isolate \( b \), divide both sides by \( h \):
\[ b = \frac{2A}{h} \]
Therefore, the equation that shows the formula in terms of \( b \) is:
\[ b = \frac{2A}{h} \]
So the correct answer is \( b = \frac{2A}{h} \).