a cylindrical vessel open at the top has a base diameter of 21 cm and height 14 cm find the cost of tin plating its inner part at the rate of 5 per 100 cm square
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diameter= 21 cm
radius=21/2=10.5
height=14 cm
curved surface area of cylinder= 2πrh
2×22/7×10.5×14
44/7×10.5×14
(14 will be eliminate with 7 )
44×10.5×2=88×10.5
924cm square
area of base circle= πr square
22/7×14
(14 will be eliminate with 7)
22×2=44
924+44=968cm square
968×5/100=4840/100
answer=48.4 rupees
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