Question
The radius of the incircle of a triangle is 6 cm. if the
area of the triangle is 30 cm 2 , then its perimeter is?Solution
Area of any triangle = inradius of triangle `xx`  Semiperimeter So 30 = 6 `xx` S or S = 30/6 = 5 cm; So perimeter = 2S =2 `xx` 5 = 10 cm
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