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A circumference of 47.12 feet.
A circle with a radius of 4 miles has a circumference of 25.13 miles.
== == 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.
Best guess for Earth Circumference is 24,900 miles (40,080 km)
Eratosthenes is said to have calculated the Earth's circumference to such a high accuracy. The major problem with these claims is that he estimated the circumference in terms of stadia. There were several different versions of the stadion and nobody knows the modern equivalent of the stadion used for his result! If the stadion is taken to be a Hellenic standard, of 185 metres, then the claim is true.