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A conical vessel of height 10ft and semivertical angle 30 to the power of ring operator end exponent is full of water. If empties in such away that the height at the water in the vessel is decreasing at a constant rate of 1ft/min. Then the rate at which the volume of water in the vessel is decreasing when its height is  6ft. is

  1. pi    
  2. 12 pi    
  3. fraction numerator pi over denominator 2 end fraction    
  4. 3 pi    

The correct answer is: 3 pi

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