Question

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?

Answer 1

$S=4\pi R^2,$

$S_m=5.08\cdot 10^{14}~m^2,$

$S_{cm}=5.08\cdot 10^{18}~cm^2,$

$S_{ft}=5.47\cdot 10^{15}~ft^2.$