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Time travel applications 
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#37
Aug2008, 12:42 PM

P: 72

The center of a sphere is simply that one and only one point that is equally distant from every point on the surface of the sphere, whether the sphere is hollow or not. It will be scary to ever see MENTOR under your name. 


#38
Aug2008, 12:50 PM

P: 2,043




#39
Aug2008, 12:56 PM

P: 72

I realize that mathematicians consider only the surface, but they still call the centerpoint the center. It is not part of the sphere but is its center. The samer holds for the circle drawn on paper. It still has a center...that is not part of the circle. The word "sphere" has Greek origins "sphaira, ball". 


#40
Aug2008, 02:54 PM

P: 2,043

At any rate it seems I cannot be helpful to you, so I leave it at that. 


#41
Aug2008, 06:30 PM

P: 1,060

Hello isly ilwott.
I suppose the surface of a sphere is a two dimensional manifold and has no centre. But it is normal and common usage to refer to the centre of the volume it encloses when thought of as being embedded in three dimensional space ( a ball ), as the centre of the sphere. We all know what it means. Matheinste. 


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