What is the diameter of the Earth?

Question

What is the diameter of the Earth?

Answer 1

The diameter of the earth at the equator is 7,926.41 miles (12,756.32 kilometers).

But, if you measure the earth through the poles the diameter is a bit shorter - 7,901 miles (12,715.43 km). Thus the earth is a tad wider (25 miles / 41 km) than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).

Answer 2

40,000/π km exactly

Answer 3

I really like the answer of 40,000/pi since a meter was defined as being 1/10,000,000 the distance from the equator to the north pole (passing through a city in france I think).

And if you assume the earth to be round, we know that Circumference = pi * D  therefore D = 40,000,000 m/pi

The problem is that the earth is not a sphere so it varies in every location and doesn't really have a diameter but any of these answers are close enough.

Answer 4

12,756 km