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What is the approximate radius of the Earth?

Answer and explanation

Correct answer: 6371 kilometres

The direct answer is A: 6371 kilometres. The radius is the distance from the centre of a sphere to its surface. The Earth’s average radius is approximately 6371 km, while its average diameter is approximately 12,742 km. Therefore A is correct. B gives the diameter, because diameter is twice the radius: approximately 2 × 6371 = 12,742 km. C, 2900 km, is approximately the depth or thickness associated with the mantle in school-level descriptions, not Earth’s radius. D, 35 km, is close to the scale of the crust in some regions, not the whole Earth. Do not confuse radius with diameter. Memory trick: radius is half the full width; 6371 doubled gives 12742.

Related tags

Earth RadiusEarth SizeInterior

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