Which value is closest to the Earth's diameter in kilometers?

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Multiple Choice

Which value is closest to the Earth's diameter in kilometers?

Explanation:
Earth’s size is described by diameter, which is about twice the radius. The Earth’s average radius is about 6,371 km, so the diameter is around 12,742 km. Of the given numbers, 12,700 km is the closest match. The other values are off by large factors: 1,270 km is far too small (about ten times smaller), 127,000 km is about ten times too large, and 12,700,000 km is vastly larger still. So 12,700 km best represents Earth's diameter.

Earth’s size is described by diameter, which is about twice the radius. The Earth’s average radius is about 6,371 km, so the diameter is around 12,742 km. Of the given numbers, 12,700 km is the closest match. The other values are off by large factors: 1,270 km is far too small (about ten times smaller), 127,000 km is about ten times too large, and 12,700,000 km is vastly larger still. So 12,700 km best represents Earth's diameter.

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