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 :

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 :
1). 12 cm
2). $6\sqrt{6}$ cm
3). $7\sqrt{6}$cm
4). 18 cm

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