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How to find the center point of a circle
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Ummon:

--- Quote from: pmc on August 20, 2008, 01:39:28 pm ---
--- Quote from: Paulson on August 20, 2008, 12:14:36 pm --- What about if you slide a rule up & down your circle so you can find
 the widest part. Then mark the centre?

--- End quote ---

Yah. And if you do it twice (once up and down and once left and right), you can reduce any measuring error by using the cross-point. That's kinda the way my mind works, but maybe there's no value in the logic.

-pmc

--- End quote ---

This is what I've done. I'd think accurate enough for general needs.
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