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To find the length of the circumference we would use C = Pi times Diameter, so if we want to find the diameter instead of the circumference we just need to rearrange the formula: D = circumference divided by Pi

1. move the diameter over the = sign and divide by the circumference

So for your example:

D = C divided Pi

D = 4 divided by Pi ( if you can't use a calculator use 3.14)

D = 1.27323....

D = 1.3 to one decimal place

hope this helped

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Q: What is the diameter of a circle whose circumference is 4 inches?
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