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Pi = circumference divided by diameter
Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
pi = circumference divided by diameter
Diameter = circumference divided by pi. (3.14159)
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.