The radius of the incircle of a triangle whose sides are 9 cm, 12 cm and 15 cm is
The radius of the incircle of a triangle whose sides are 9 cm, 12 cm and 15 cm is
1). 9 cm
2). 13 cm
3). 3 cm
4). 6 cm
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I am not sure, may be 13 cm is correct
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