The circle's radius is the distance from the circle's center to any point on the circumference. It is half of the diameter, which is the longest distance across the process. The formula for the circumference of a circle is 2 * pi * r, where pi is a mathematical constant approximately equal to 3.14 and r is the circle's radius.
In this case, we know the track's circumference to be 637 feet, and we can use the formula to solve for the radius. By dividing 637 by 2 * pi, we obtain the value of the radius, which is approximately 100.72 feet.