A cyclinderical vessel open at the top has a base diameter of 21cm and height 14cm .find the cost of tin plasting its inner part at the rate of €5per 100 cm square.
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Step-by-step explanation:
lsa of cylinder is 2pierh
- r=21/7
- h=14
- 2×22/7×21/7×14
- 2×22×3×2
- 262cm square
area of base is pie r square
- 22/7×21/7×21/7
- 22×3×3×1/7
- 28.28cm square
inner area of cylinder is 262+28.28
- 290.28cm square
cost=290.28/100=2.9028×5
- 14.5140
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