Euclid's Muse

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Circle isotomic

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Phil Todd



The circle isotomic is the locus of the reflections of a given point in the tangents to the circle.

It is easy to convince yourself that it is also the envelope of the circles whose centers lie on the circle and which pass through the given point.

The given point is C.  Try dragging it outside the circle.

Tags: isotomic, curve, envelope, limacon
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