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There is no such specific unit of measure as a circumference - a circumference is merely the distance around something.
It is: circumference/diameter = pi which is 3.142 rounded to 3 decimal places
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers). Since the earth rotates around its axis every 24 hours: 40,075.16 kilometers [divided by] 24 hours = 1669.7983 kilometers per hour <---(answer)
The circumference is 59.66 feet.
circumference = pi*17 feet