So the distance from the north pole to the equator is...

approximately 10,000 km. I have to use this information to find an approximate value for the earth's radius but I'm not sure where to start. Please help if you can! There's a diagram in the comments :)

Question

So the distance from the north pole to the equator is...


approximately 10,000 km. I have to use this information to find an approximate value for the earth's radius but I'm not sure where to start. Please help if you can! There's a diagram in the comments :)

anonymous · Answer

attachment

cwrw238 · Answer

this distance = 1/4 of the circumference
since the earth approximates to a sphere 
we can use
40,000 = 2*pi*r
where r = radius

so r =  40,000 / 2* pi

anonymous · Answer

Okay, that makes sense

cwrw238 · Answer

yea
simplifying a bit
r = 20,000 / pi   km

anonymous · Answer

When it's simplified it makes even more sense lol