Quoted By:
Take a point C, and another casual point that is not on the first one.
Now draw all the existing points that have the same distance to C. You will have a circle, a sphere, an hypersphere or whatever.
If you have a two dimensional space and this space is completely flat (if you draw a triangle on this space the sum of all angles is 180°) the length of this circle divided by 2 times the distance from C to it's equidistant points, is pie.
