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

submitted 4 weeks 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 4 weeks ago* (last edited 4 weeks ago)

Very cool, and thanks for the diagram!

That will work for me, I think, but drawing a tangent isn't a standard straightedge operation. If Wikipedia is to be believed there's still a "pure" solution to be found, just involving connecting intersection points.

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