The earth is nearly a spherical object and its surface area = 4*pi*radius2
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Assume the Earth is a sphere (that's fairly close to its real shape), and use the formula for the surface area of a sphere (4 pi r2)
You measure or calculate the surface area; you measure or calculate the volume and then you divide the first by the second. The surface areas and volumes will, obviously, depend on the shape.
The formula to calculate the surface area of a 90-degree elbow is A = πDL, where A is the surface area, D is the diameter of the elbow, and L is the centerline radius. The surface area of the elbow is essentially the curved surface area of the elbow pipe fitting. This formula is derived from the mathematical principles of geometry and calculus, specifically the surface area of a cylinder.
The surface-area-to-volume ratio may be calculated as follows: -- Find the surface area of the shape. -- Find the volume of the shape. -- Divide the surface area by the volume. The quotient is the surface-area-to-volume ratio.
1) Calculate the area 2) Calculate the volume 3) Divide the area by the volume to get the ratio
About 71%