A, B, C are the centres of three circles touching each other externally, with radii 3 cm, 4 cm and 5 cm respectively. Find the perimeter of AABC.

A, B, C are the centres of three circles touching each other externally, with radii 3 cm, 4 cm and 5 cm respectively. Find the perimeter of AABC.
1). 10 cm
2). 12 cm
3). 24 cm
4). 18 cm

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