Oct 17, 2026, 9:14 PMLastly, set each of the ends of each perpendicular line _not_ on the chords to be on the other perpendicular line. This will combine into one point, which is your centre.
I find this is often useful when you want to either widen, or shrink, a hole, while keeping its centre in the same place.
Adapted from here: https://www.instructables.com/How-to-Find-the-Center-of-a-Circle-1/
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