Show that the centers of the family of circles all of which are tangent to a given circle and also to a given line form a parabola.

*Proof.***Incomplete.**

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Stumbling Robot

A Fraction of a Dot
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Show that the centers of a family of circles form a parabola

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### Point out an error, ask a question, offer an alternative solution (to use Latex type [latexpage] at the top of your comment):

Show that the centers of the family of circles all of which are tangent to a given circle and also to a given line form a parabola.

*Proof.***Incomplete.**

Let r_0 be the radius of the given circle, and L be the line to which the family of circles should be tangent. This is a similar problem like the previous one, with a difference that the actual directrix of the prabola is at the distance r_0 from L.