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    Question

    The radius of the incircle of a triangle is 10 cm. if

    the area of the triangle is 60 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 triangleĀ x Ā Semiperimeter So 60 = 10 x S or S = 60/10 = 6 cm; So perimeter = 2S =2 x 6 = 12 cm

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