Estimate the order of magnitude of surface area of earth.

Answer

15

Explanation

As is known, radius of earth, `R = 6.4xx10^6m`
surface area of earth` = 4pi R^2`
`=4xx3.14(6.4xx10^6)^2m^2`
`A = 5.14xx10^(14)m^2`
As 5.14 gt 5, therefore order of magnitude of surface area = 15