1. If two circles touch each other internally, they have only one common straight tangent.
2. If two circles touch each other internally, they have only one common straight tangent.
3. If circle \(A\) has a radius of \(r\) units and circle \(B\) has a radius of \(R\) units \((R > r)\), the two circles will have only one common tangent if—?
(a) AB=R+r (b) AB\(\gt\)R+r (c) AB=R-r (d) AB\(\lt\)R-r
4. The circle \(C_1\) has a radius of \(r\) units, and the circle \(C_2\) has a radius of \(R\) units, where \(R > r\). The two circles will have only one common tangent if—.
(a) \(C_1C_2=R-r\) (b) \(C_1C_2=R+r\) (c) \(C_1C_2>R-r\) (d) \(C_1C_2\lt R-r\)
