Assuming the earth to be a sphere of radius 6370km if seventy five percent of the earth's surface is covered by water then find how many square kilometres is area of the land

(1 - .75) * π * 4 * r^2

To find the area of the land on Earth, we first need to calculate the area of the entire Earth and then subtract the area covered by water.

1. Calculate the area of the Earth:
The formula to calculate the surface area of a sphere is given by:
Surface Area = 4πr^2
where r is the radius of the Earth (6370 km).

Surface Area = 4π(6370 km)^2
Surface Area = 4π(40594000 km^2)
Surface Area = 162376000π km^2

2. Calculate the area covered by water:
Given that 75% of the Earth's surface is covered by water, we need to find 75% of the total surface area of the Earth.

Area of water = 0.75 * Surface Area

3. Calculate the area of the land:
The area of land is obtained by subtracting the area of water from the total surface area of the Earth.

Area of land = Surface Area - Area of water

Now, let's calculate the area of the land:

Area of land = 162376000π km^2 - (0.75 * 162376000π km^2)
Area of land = 162376000π km^2 - 121782000π km^2
Area of land ≈ 40594000π km^2

Calculating this value explicitly is not possible since π is an irrational number with infinite decimal places. However, you can round the value to the desired number of decimal places if necessary.