# The Distance Between the Centres of Two Circles of Radii 6 cm and 3 cm is 15 cm :

The distance between the centres of two circles of radii 6 cm and 3 cm is 15 cm. The length of the transverse common tangent to the circles is:

- 18 cm
- 12 cm
- 6√6 cm
- 7√6 cm