Question
The radius of the incircle of a triangle is 3 cm. if the
area of the triangle is 12 cm 2 , then its perimeter is?Solution
Area of any triangle = inradius of triangle `xx`  Semiperimeter So 12 = 3 `xx` S or S = 12/3 = 4cm; So perimeter = 2S =2 `xx` 4 = 8 cm
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