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...er, the two terms are used interchangeably; a statement that an object is "spherical" does not imply that it is hollow (still less that it is of [[infinitesimal ...ling shape|space-filling]] [[set]] of nested spheres, is the basis for a [[spherical coordinate system]] sometimes used in [[geometry]].

...f course be derived for areas of curved surfaces as well. The area of a [[spherical triangle]] on a sphere of radius ''R'', for example, can be written as <mat ...x)</math> is simply the integral of the difference of the areas under each curve, <math>\int \left ( f(x) - g(x) \right ) dx</math>.