the diameters of the top and the bottom portions of a bucket are 42cm and 28cm.respectively, if the height of the bucket is 24cm, then the cost of painting its outer surface @ of 50paise/cm square is ?

• Ans=1375 Rs
  If Radius of Top=R, Bottom=r & Height=h
  Surface Area=Pi*(R+r)Sqrt[(R-r)^2+h^2]=Pi*(21+14)Sqrt[7^2+24^2]
  =(22/7)*35*25=2750 sq.cm.
  cost of painting@50 paise=2750*0.5= 1375 Rs.
• 11 years agoHelpfull: Yes(1) No(0)