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Tangent Circles to Two Circles
Given two distinct circles, the locus of the centers of all circles tangent to those two circles is a branch of a hyperbola or a staight line if the radii of the two circles are equal. The centers of the circles are the foci of the hyperbola.
Contributed by:
Abraham Gadalla
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Hyperbola
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Tangent Circles
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MathWorld
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PERMANENT CITATION
"
Tangent Circles to Two Circles
" from
the Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TangentCirclesToTwoCircles/
Contributed by:
Abraham Gadalla
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