2006-11-07 10:23:03 · 2 answers · asked by see 2 in Science & Mathematics ➔ Earth Sciences & Geology
First ... assume an average diameter (or radius) for the planet.
The average radius normally given is 3963.1 miles (6378 km).
Circumference of a circle = 2 * pi * r = pi * d
Circumference = (2) * (3.14159) * (3963.1) = 24900.9 miles
... which is approximately 40074 km.
2006-11-07 10:29:58 · answer #1 · answered by CanTexan 6 · 0⤊ 0⤋
The average radius of the Earth is 3,959 miles (6,374 kilometers).
The equitorial diameter of the Earth (distance from one side of the Earth to the other at the equator) is about 7,926 miles.
The ratio of the circumference to the diameter of a circle (circumference/diameter)
is written as the symbol pi.
Pi is approximately 3.141592.
3.14159265
3.1415926535
Therefore, to determine the circumference from the diameter given above:
equitorial diameter x 3.141592 = equitorial circumference
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7,926 x 3.141592 = 24,900
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The earth has a circumference of approximately 24,900 miles.
More precisely the circumference of the earth
at the equator is 24,902 mi / 40,076 km.
2006-11-07 19:05:19 · answer #2 · answered by kevink8125 2 · 0⤊ 0⤋