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      Question

      A rectangle has a perimeter of 60 cm, and the ratio of

      its length to its width is 3:2. Find the length of its diagonal.
      A 17 cm Correct Answer Incorrect Answer
      B 19 cm Correct Answer Incorrect Answer
      C 21 cm Correct Answer Incorrect Answer
      D 24 cm Correct Answer Incorrect Answer

      Solution

      Let length = 3x and width = 2x. Perimeter = 2 * (length + width) 60 = 2 * (3x + 2x) 60 = 10x x = 6 So, length = 3x = 18 cm and width = 2x = 12 cm. Diagonal = √(18Β² + 12Β²) = √(324 + 144) = √468 β‰ˆ 21 cm Correct Answer: c) 21 cm

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