What is the radius of the Earth?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 6371 km.
The average radius of the Earth is approximately 6,371 kilometres (3,959 miles). However, because the Earth is not a perfect sphere but an oblate spheroid, the radius varies slightly. The equatorial radius is about 6,378 kilometres (3,963 miles), while the polar radius is slightly shorter at about 6,357 kilometres (3,950 miles). This variation is due to the Earth's slightly flattened shape at the poles and bulge at the equator.