A sphere with a radius of 687 km has a volume of 1,358,184,658.3 km3
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Lets pretend that the Earth is a perfect sphere. Surface area of a sphere = 4(pi)(radius)^2. The radius of earth is 6378.1 km. Plug that into your equation and you'll get your answer.
A circle with a radius of 1.8 km has a circumference of 11.31 km
radius = 48/2 = 24 km
Radius = approx 6050 km, so diameter = 12100 km.
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