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Circles of Apollonius


	Apollonius' problem asks for the circle tangent to three given circles or lines. Finding a circle tangent to three circles is the most difficult form of this problem. The solution is obtained by solving three simultaneous equations, , with at most eight solutions.


	Contributed by: Vivian Feig

Apollonius' Problem (Wolfram MathWorld)

"Circles of Apollonius" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/CirclesOfApollonius/

Contributed by: Vivian Feig

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