Definition : - Radius of the earth is the distance [link] from the center of the earth to a point on or near its surface . A nominal radius of the earth is sometimes used as a unit of measurement in astronomy and geophysics. The radius of the earth is 6,371 km. The earth is a spherical object so it has a radius of 6,371 km at the equator, but the radius of the earth is 6,384 km at the poles [link].
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