CIRCLE • CIRCLE • LINE
Download GeoGebra file
Circles with Internal Tangency, Line Tangent to Inner Circle
Number of solutions: 4
GeoGebra construction
Steps
- Construct the circle of inversion. Choose the point of tangency T as its center.
- Apply the inversion to the given objects. In the chosen inversion, the given line remains invariant. One of the given circles is transformed into a line parallel to it.
- Identify the images of the solutions. The first three are circles located in the strip between the two parallel lines. The fourth is a tangent to the image of the circle, which is parallel to both lines. The image of the point of tangency with the remaining two objects lies at infinity.
- Apply the inverse transformation to the found circles and line.
- The problem has four solutions.