It is the formula for the circumference C of a circle where D is the diameter.
C = (pi) D
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Circumference equals pi times diameter; so C = 84*pi or about 263.9.
Circumference equals pi times diameter. Therefore you divide 39 by pi and get about 12.41
To find the diameter of a circle given its circumference, you can use the formula: diameter = circumference / π. In this case, the circumference is 130mm. So, the diameter would be 130mm / π ≈ 41.34mm.
The circumference equals the diameter times pi; therefore, the circumference of this circle is 24 X pi = 75 feet, to the justified number of significant digits (limited by "24").
The circumference is 4pi