== == Given that the circumference of the earth is 40,075.02 km (measured at the equator) the circumference in inches is roughly 1,577,756,664 inches.
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7 foot circumference X 12 inches/foot = 84 inches in circumference
about 12.57 inches
A circumference of 6.28 inches measures exactly 6.28 inches!
4.842519685039370078740157480315 inches
The circumference is 53.41 inches.