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How do you find the center of two concentric circles with just a straightedge? (lemmy.sdf.org)

submitted 5 months ago by [email protected] to c/[email protected]

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The Wikipedia article on Steiner constructions mentions it, but doesn't explain it, and the source linked is a book I don't have. This has come up in a practical project.

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[–] [email protected] 1 points 5 months ago

Exactly. I could do a straightedge construction of 90 degrees, but not until I have a center, so I'm back at square one.

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