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# Geometry/Make a half sphere using pi

Ashly wrote at 2014-02-14 03:12:43
This equation doesn't involve Pi, but it is pretty accurate, as long as you only dap and form the metal, you don't actually stretch it.

quite simply:

D of disk = D of sphere x 1.3

So you need to know how big you want the sphere/hemisphere to be at the end, but once you've got that diameter, just multiply that by 1.3 and the result it the diametre of your starting disc.

Don't know why, that's just what I was taught and it works pretty much every time.

Geometry

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