The radius of the Earth is the circumference divided by $2\pi.$ Given the circumference is 40 million metres, that makes the radius about 6366km.

This is important when measuring the distance to the horizon, and things like orbital velocity, or the distance to the moon.

CategoryMaths
Last change to this page
Full Page history
Links to this page
 Edit this page
  (with sufficient authority)
Change password
 Recent changes
All pages
Search