Multiple choice

What is the exact difference between average equatorial and polar radius of the earth?

  1. 42.2 km

  2. 21.4 km

  3. 42.78 km

  4. 23.76 km

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Earth is an oblate spheroid. The equatorial radius is approximately 6378.1 km and the polar radius is approximately 6356.8 km, yielding a difference of roughly 21.4 km.