If a circle has a radius of 5 meters, what is the circumference?
If a circle has a diameter of 17 inches, what is the circumference?
If a circle has a circumference of 628 cm, what is the diameter?
Circle circumference is
pi * d
or pi * 2 * r since d = 2r (don't forget units : meters, inches, cm etc in your answer !)
circumference/pi = d
+5 
