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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 triangle┬аx ┬аSemiperimeter So 60 = 10 x S or S = 60/10 = 6 cm; So perimeter = 2S =2 x 6 = 12 cm

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