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d'Alembert's Theorem


If three circles A, B, and C are taken in pairs, the external similarity points of the three pairs lie on a straight line. Similarly, the external similarity point of one pair and the two internal similarity points of the other two pairs lie upon a straight line, forming a similarity axis of the three circles.


See also

Similarity Point

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References

Dörrie, H. 100 Great Problems of Elementary Mathematics: Their History and Solutions. New York: Dover, p. 155, 1965.

Cite this as:

Weisstein, Eric W. "d'Alembert's Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/dAlembertsTheorem.html

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