Three circles of radii 3.5 cm, 4.5 cm and 5.5 cm touch each otherexternally. Then the perimeter of the triangle formed by Joining the centres of the circles, in cm, is

Three circles of radii 3.5 cm, 4.5 cm and 5.5 cm touch each otherexternally. Then the perimeter of the triangle formed by Joining the centres of the circles, in cm, is
1). 27
2). $\pi[(3.5)^{2}+(4.5)^{2}+(5.5)^{2}]$
3). $27\pi$
4). 13.5

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