EDIT: To find the diameter, using the circumference - you divide the circumference by the value of Pi - Snakester1962 (Supervisor)
Diameter = Circumference/pi
Diameter = circumference/pi
Circumference of a circle = 2*pi*radius
Circumference = 2*pi*radius
Pi is the number of times the diameter of a circle will fit into the circumference. Pi is not a circle, and does not have a circumference or area. To calculate a circumference USING pi, the circumference is diameter * pi. To find the area using pi, area = pi * radius * radius
Pi, or 3.14159... Using the equation Circumference = pi * diameter.
Divide the circumference by pi, and that will give you the diameter.
If: circumference = pi*diameter Then: pi = circumference/diameter
Divide the circumference by Pi.
The circumference of a 7-foot diameter circle using 3.14 for Pi is: 21.98 feet (diameter x Pi = circumference).
Circumference of a circle = 2*pi*radius or diameter*pi