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      Question

      A sphere has a volume of 121.5╧А cm3. Find

      its radius.
      A 2.5 cm Correct Answer Incorrect Answer
      B 9 cm Correct Answer Incorrect Answer
      C 4.5 cm Correct Answer Incorrect Answer
      D 5 cm Correct Answer Incorrect Answer

      Solution

      Let the radius of the sphere be 'r' cm. Volume of sphere = (4/3) X ╧А X r3 So, 121.5╧А = (4/3) X ╧А X r3 Or, (729/8) = r3 So, r = (9/2) = 4.5

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