Question

. The Earth is approximately a sphere of diameter 12742 km. The surface area of a sphere is given by the formula A = 4π r² Calculate the surface area of the Earth. Give your answer in metres squared and in standard form. (Take pi = 3.142)


it is urgent

Answer 1

First find out the radius of earth.

so, radius :

Surface area =

= 510269772.6 km.

= 510269772571.42 m

Answer 2

Step-by-step explanation:

$radius = \frac{diameter}{2}$

Surface area is given by

$4\pi \: r ^{2} = 4 \times 3.142 \times {( \frac{12742 \times {10}^{3} }{2} )}^{2}$

$= 12.568 \times ({6371000})^{2} \\ = 5.10130608 \times {10}^{14} \: {mtr}^{2}$