- Tangent to Circle-1
- Problem 1: Tangent to Circle-1
- Converse of Tangent to Circle-2
- Problem 1: Converse of Tangent to Circle-2
- Equal Tangent Segments from a Point to a Circle-3
- Problem 1: Equal Tangent Segments from a Point to a Circle-3
- Distance of Centers of Externally Tangent Circles-4a
- Problem 1: Distance of Centers of Externally Tangent Circles-4a
- Distance of Centers of internally Tangent Circles-4b