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Math in astronomy.
Superficial area: 3/4
3/4*pi*r^2
Volume:
*pi*r^3
The diameter of the earth at the equator is: 12,756.32 km. But at the poles it is: 12,715.43 km. So now you must tak the mean of this measurements in order to get a more acurate result of its volume and superficial area.
Since a planet is not perfectly spherical you must first take the mean of the radio and then you have a somewhat acurate result of the volume and superficial area of a planet.
Earth's diameter mean: 12735.88
