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