Where r is the radius of the Earth, and pi = 3.14 (2 decimal places). So, it's 4 thirds multiplied by pi multiplied by the cubed radius of the Earth (6378.1Km average)
The best estimate for the Earth's volume is about 1083210000000 cubic km
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Use the equation for the volume of a cone, replace the known height and volume, and solve the resulting equation for the radius.
Width x Length x Height = Volume.
The equation to find mass is DxV (density times volume.) NM
l x w x h
There are none because a square can't be expressed in terms of volume