To solve the formula $A = \frac{1}{2}bh$ for $b$, follow these steps:

1. Start with the original formula: $A = \frac{1}{2}bh$

2. To isolate $b$, first multiply both sides of the equation by 2 to eliminate the fraction: $2A = bh$

3. Finally, divide both sides by $h$ to solve for $b$: $b = \frac{2A}{h}$

So, the formula for $b$ is: $b = \frac{2A}{h}$

Would you like more details on any step or have any questions?

Here are 5 related questions for practice:

1. If $A = 20$ and $h = 5$, what is $b$?
2. How would you rearrange the formula to solve for $h$ instead of $b$?
3. What is the geometric meaning of the formula $A = \frac{1}{2}bh$?
4. If $b$ is doubled and $h$ is halved, how does the area $A$ change?
5. How can you verify the correctness of the formula $b = \frac{2A}{h}$ by substituting back into the original equation?

Tip: When rearranging formulas, always perform the same operation on both sides of the equation to maintain equality.