need your help.?

Question

1) Calculate the volume and surface area of the earth,assuming that it is a sphere of radius 6,370km.
Give your answer in standard form,
corrected to 3significant figures.

Answer 1

The surface area is given by 4 pi r^2 = 4 x pi x 6370^2 = 5.10 x 10^8 km^2.
The volume is (4/3) pi r^3 = (4/3) x pi x 6370^3 = 1.083 x 10^12 km^3