What is the length of the Earth?

Answer 1

Because the earth is circular, it goes on forever. Actually, the answer depends on which way you are measuring. Circumference, radius, diameter, time-in-existence, all have different answers. Because the Earth is not 2-dimensional or has any sharp points, length is called circumference. And the circumference of earth is about 24, 901 miles, or 40, 075 km, at the equator. Earth is not a perfect sphere, it is an oblate spheroid, meaning it has a bulge at the equator and a depression at the poles. The earth at the poles is about 40,007 km or 24, 853 miles.

Sources:
1.http://geography.about.com/library/faq/blqzcircumference.htm
2.http://www.universetoday.com/26461/circumference-of-the-earth/

Answer 2

Because the earth is circular, it goes on forever. Actually, the answer depends on which way you are measuring. Circumference, radius, diameter, time-in-existence, all have different answers.