The mean radius of the earth is 6360 km. (a) What is the are of the earth’s surface in square meters?
Square centimeters? Square feet?
"S=4\\pi R^2,"
"S_m=5.08\\cdot 10^{14}~m^2,"
"S_{cm}=5.08\\cdot 10^{18}~cm^2,"
"S_{ft}=5.47\\cdot 10^{15}~ft^2."
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