It seems you've uploaded a new file with a similar question about the radius of a circle. The problem asks to find the radius when the circumference of a circle is $13\pi$ inches.

We can use the formula for the circumference of a circle:

$C = 2\pi r$

Given that the circumference $C = 13\pi$, we can substitute this into the formula:

$13\pi = 2\pi r$

Now, solve for $r$ by dividing both sides by $2\pi$:

$r = \frac{13\pi}{2\pi}$

Cancel out the $\pi$'s:

$r = \frac{13}{2} = 6.5$

So, the radius is 6.5 inches.

Do you need further explanation or have any questions about this solution? Here are some related questions you might find useful:

1. How would you calculate the area of a circle given its radius?
2. What happens to the circumference of a circle if the radius is doubled?
3. How do you derive the formula for the circumference of a circle?
4. What is the difference between diameter and radius in a circle?
5. How can you calculate the volume of a sphere from its radius?

Tip: Whenever you're dealing with the circumference formula, remember that it's $C = 2\pi r$, where the radius is a