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Question

It is required to make a closed circular cylindrical tank of height $$1\ m$$ and base diameter $$140\ cm$$ from a metal sheet. How many square meters of the sheet are required for the same?


Solution

Given:
Height $$=1$$ m, radius $$=\cfrac{140}{2}=70$$ cm$$ =0.7$$ m

Area of sheet required $$=$$ Total surface area of tank

$$=2\pi r ({r}+h)$$

$$=2\times \cfrac{22}{7}\times 0.7(1+0.7){m}^{2}$$

$$=7.48$$ m$$^{2}$$

Mathematics
RS Agarwal
Standard IX

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