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eyspy
03-22-2009, 04:36 AM
Hi.

I need to know how to get a circle with the 'EXACT' circumference of 80 cm

I have no idea how to start this ????

mla2ofus
03-22-2009, 06:34 AM
Divide 80 by 3.14 = diameter divided by 2 = radius.
Mike

denrep
03-22-2009, 06:37 AM
Hi.

I need to know how to get a circle with the 'EXACT' circumference of 80 cm

I have no idea how to start this ????

circumference 80 ÷ 3.14 (pi) = diameter roughly 25.47

But if you mean really "EXACTLY", start calculating, because:
pi = 3.141592653589793238462643383279502884197169399375 10. . . :)

eyspy
03-22-2009, 07:37 AM
Thanks guys, I knew someone would be smarter than me (Not hard).

Cheers .....

William McCormick Jr
03-22-2009, 02:02 PM
Hi.

I need to know how to get a circle with the 'EXACT' circumference of 80 cm

I have no idea how to start this ????

What are you making.

If it is thick metal, especially, you are rolling you also have to add one thickness of material to the actual diameter you are calculating for.

Up to really large diameters where the metal does not compress as much as it stretches.

That should have ruined your day. Ha-ha.

Sincerely,

William McCormick

fluffy
04-27-2009, 04:00 PM
do you need the circumference to be the ID or the OD? that will play a part in everything.