Welcome to help with math problems,
The radius of any circle is the length of a straight line segment that
runs from the center of a circle to the circle itself. And a
'straight' line segment, in the most general sense, is the shortest
one that you can draw between any two points.
To someone who thinks that he can only measure things along the
surface of the earth - because he lives in two dimensions, here you can
get free online math help ;not three - the definition of 'radius' that we're using
above would be perfectly reasonable, even obvious.
If he looked at smaller and
smaller circles, he might notice that as the diameter of a circle gets
close to zero, the circumference gets closer and closer to the number
3.14..., and he might call that number 'pi'. learn more on help in math.
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