Final answer:
The total landmass of Africa is approximately 30 million square kilometers, based on the Nile River basin covering 3 million square kilometers, which is nearly 10% of the continent's landmass.
Step-by-step explanation:
The total landmass of Africa is approximately 30 million square kilometers. This estimation is based on the information provided that the Nile River's basin, which covers about 3 million square kilometers, comprises nearly 10% of Africa's landmass. By multiplying the Nile basin's coverage by 10, we can determine the entire continent's approximate size.
Africa's extensive landscape hosts the Nile, the world's longest river, supporting ecosystems and civilizations since ancient times. The river's regular flooding made agriculture feasible in regions like the Nile River Valley, allowing early societies like Pharaonic Egypt to flourish. Today, the Nile continues to play a critical role in the lives and economies of millions of people across several African countries.