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 Topic: apollonius
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 One central circle and three tangent circles 2011-10-16 From Margaret:You have one central circle and three or more circles tangent to the outside of the circle of varying radii. You know the x,y coordinates of the centers of the other circles. If you now remove that central circle (and pretend you never knew where it was), can you calculate its center in x,y coordinates?Answered by Chris Fisher. Four tangent circles 2005-12-06 From Ananth:I have one bigger circle A with radius 15. Inside this bigger circle i have another circle B with radius 3 which touch this bigger circle. Have another circle C with radius 4 which touches A and B. I would like to draw a biggest circle which touches A,B and C. Answered by Chris Fisher. The problem of Apollonius 2004-04-25 From Mitja:There are given 2 circles lying one out of another and one point out of both circles. How to construct a circle passing through a given point and internally tangent to one and externally tangent to the other cirlce?Answered by Chris Fisher.

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