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    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?
    A 6 cm Correct Answer Incorrect Answer
    B 8 cm Correct Answer Incorrect Answer
    C 10 cm Correct Answer Incorrect Answer
    D 12 cm Correct Answer Incorrect Answer

    Solution

    Area of any triangle = inradius of triangle┬а`xx` ┬аSemiperimeter So 12 = 3 `xx` S or S = 12/3 = 4cm; So perimeter = 2S =2┬а`xx` 4 = 8 cm

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