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      Question

      The length of a rectangle, area of which is 168

      cm2, is equal to the radius of a circle of area 616 cm2. Find the perimeter of the rectangle?
      A 74 cm Correct Answer Incorrect Answer
      B 64 cm Correct Answer Incorrect Answer
      C 22 cm Correct Answer Incorrect Answer
      D 52 cm Correct Answer Incorrect Answer

      Solution

      Let the radius of the circle = r Area of circle = 616 = 22/7 × r × r ⇒ r = 14 cm Area of rectangle = 168 = L × B = 14 × B ⇒ B = 12 cm Perimeter = 2 × (L + B) = 2 × (14 + 12) = 52 cm

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