Question 150994
Circumference is the distance around a circle. The radius is the distance from the circle to the center of the circle.  The diameter is the distance from one end of the circle to the other, through the center.

We're given:
circumference = 27

The formula for circumference is:
Circumference = pi * diameter

Solving for diameter:
27 = pi * diameter
8.60 = diameter

The radius is half the diameter so:
radius = 8.60/2 = 4.30 inches