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7
votes
How can we determine the center of a circle using a straightedge?
Edit: The following answer was written assuming that the ambiguous phrase “given a circle with diameter $AB$” in the question is to be interpreted as “given a circle having diameter $AB$” rather than …
13
votes
Accepted
Wanted, dead or alive: Have you seen this curve? (circular variant of cardioid)
As per the original poster's suggestion, here is a slightly expanded version of what I posted as a comment:
If we consider the envelope of the family of lines $L_\theta$ which connect the points with …