Circumference = 3.14 * diameter
Diameter = 2 * radius
To find the radius, we can use this equations, but backwards.
First, let's convert the circumference to the diameter.
13 / 3.14 = 4.14
Now, let's divide this by 2 to find the radius.
4.14 / 2 = 2.07
The radius of a circle with a circumference of 13 feet is 2 feet.