Multiple choice The equatorial circumference is greater than the polar circumference by approximately 22 km 75 km 125 km 625 km Reveal answer Fill a bubble to check yourself B Correct answer Explanation Due to the centrifugal force generated by the earth's rotation, the planet bulges slightly at the equator. The equatorial circumference is about 40,075 km, while the polar circumference is about 40,008 km, giving a difference of roughly 75 km.