What is the land area of Africa?​

11.73 million mi²

Explanation:

Africa is the world's 2nd-largest and 2nd-most populous continent, after the continent of Asia in both cases. At 30.37 million km² including islands, it covers six percent of the planet Earth's total surface area and 20 percent of its land area. With 1.3 billion people as of 2018, it accounts for about 16 percent of the world's total human population.

The answer is 30.37 million km².

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i would say b. research typically uses a variety of sources