Two circles c_{1} and c_{2}, and a line l are given. All circles which are tangent to the given circles and to the given line shall be constructed.

You can drag the centers of the circles c_{1} and c_{2} or the line l, and vary the radii (with pressed mouse
button). For each type of solution, you can decide, whether the solution circles are to be drawn. The total number of solutions
is indicated on the bottom right.