Sphere Volume.

[PANAMATIK]

(03-31-2016 11:29 AM)ggauny@live.fr Wrote:  Hi,
All of us know that Sphere Volume is calculate like this :

4/3(PI*R^3)

A short cut from Bill Kolb is : "240 'D-R' R^3 *",

But NASA (on his siteweb) say (PI*D^3)/6.

It is more easy and less steps, even I dont' see how go from first formulae to
NASA one ?

PI * R * R * R * 8/6 =
PI * 2R * 2R * 2R * 1/6

Bernhard