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The formula for the circumference of a circle is the same, whatever its diameter. Circumference = pi*diameter.
Circumference = pi*diameter.
pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203
When you are given the circumference of a circle asked to find the diameter, divide the circumference by pi. The formula for circumference is pi x diameter, so the formula for diameter is circumference divided by pi. So 7 divided by pi equals about 2.22.
Circumference = pi x diameter therefore - Diameter = Circumference/pi