If the shortest distance of a given point to a given circle is 4 cm and the longest distance is 9 cm, then the radius of the circle is
- A2.5 cm or 6.5 cm
- B6.5 cm
- C5 cm or 13 cm
- D2.5 cm
If the shortest distance of a given point to a given circle is 4 cm and the longest distance is 9 cm, then the radius of the circle is