Three circles with radii 3 cm. 4 cm and 5 cm touch each othe

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Three circles with radii 3 cm. 4 cm and 5 cm touch each other externally. If their centres are A, B and C, what is the perimeter of the triangle ABC ?

[DSSSB PRT 2014]

A 12 cm

B 18 cm

C 24 cm

D 36 cm