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December 11th, 2012, 11:59 PM  #1 
Newbie Joined: Dec 2012 Posts: 1 Thanks: 0  sphere equation formulation
Hi to all; I want to ask that does any one know how to make sphere equation (xx1)^2 + (yy1)^2 + (zz1)^2 = R^2; or from where it comes..? If you know answer then tell me, or if you know any link then please suggest me..? 
December 12th, 2012, 12:27 AM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 466 Math Focus: Calculus/ODEs  Re: sphere equation formulation
It comes from the distance formula in 3 dimensions. The surface of a sphere is the locus of all points equidistant from come central point (the center). If we let the center be and the radius be , then by the distance formula, we have: and we now have the locus of all points whose distance from is . 

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