WOLFRAM|DEMONSTRATIONS PROJECT

Tangent Circles to Two Circles

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distance between the two centers
0
left radius
9.5
right radius
3.65
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.