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$$=0.7$$ mArea 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$$^{2}$$MathematicsRS AgarwalStandard IX

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