Radius
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The radius of a circle is the distance from the center to any point on the circle. Identical definitions hold for the sphere and hypersphere.
![[asy]size(100); pair O=(0,0), P=dir(30); D(unitcircle); D(O--P); MP("O",D(O),NNW); MP("P",D(P),NE); MP("r",midpoint(O--P),NNW);[/asy]](http://latex.artofproblemsolving.com/7/9/7/7976f3500a2348b7b93f1f1dae9c1f5ea8ba275a.png)
