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   formula  for surface area of cone       
            A = π r l        where    A  =area,   r  = radius  &     l  = slant height
             so    l    =    A /πr
   formula for volume of a cone  
         V   =  1/3 πr²h       where     h  = vertical height 
         so     h  =   3V /π r²

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