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      Question

      If the lengths of the diameters of two concentric

      circles are 16cm and 18cm respectively, then what will be the area of the region between them?
      A 7π cm² Correct Answer Incorrect Answer
      B 25π cm² Correct Answer Incorrect Answer
      C 17π cm² Correct Answer Incorrect Answer
      D 28π cm² Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Length of diameter of small circle = 16cm  Radius (r) = 16/2 = 8cm Length of diameter of big circle = 18cm  Radius (R) = 18/2 =9cm  Area of the circle = πr² Area of the region between them = πR² - πr² =π (81-64) = 17π cm²

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