Circumference of 20 / pi = the diameter = 6.3662 (to nearest 4th decimal)
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No; circumference divided by diameter equals pi.
there is no equation of Pi Circumference divided by diameter
4.9 divided by pi = 1.56
Circumference equals the diameter times pi. The diameter is 2 times radius. Radius equals Circumference divided by pi then divided by 2.
Area = circumference squared... You do circumference divided by 4,... and then divide that by Pi.