Question

The radius of the Earth is close to 6371 km. The area of land on Earth is estimated to be 29% percent of the Earth's surface.
The area of land on Earth =_________
million square kilometres.
(Note: Round the value to the nearest million.)​

Answer 1

Given,

The radius of the earth is = 6371 kilometres

The area of land on Earth is estimated to be 29% percent of the Earth's total surface.

For, calculating the total land area we need to calculate the total surface area of the earth by using the 4πr² formula.

The radius (r) = 6371 km

Surface area = 4 × 22/7 × 6371 × 6371 = 510269772 km²

Land area = 510269772 × 29/100 = 147978234 km²

Hence, The area of land on Earth = 147.9 = 148 million square kilometres. (Rounded off to the nearest million)