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.
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pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203
The formula relating circumference and diameter is C = d*pi, so the diameter is 7/pi.
7/pi = diameter
The circumference is about 22 units.
Diameter = 7/pi = 2.228169203 inches