It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet.

Monjur Alahi

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


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Salim Ahmed Kawsar

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Here, h = 1 m, r = 140/ 2 cm = 70 cm = 0.7 m 

Total surface area of the cylinder = 2πr (h + r) 

= 2 × 22/ 7 × 0.7 (1 + 0.7) m2 

= 44 × 0.1 × 1.7 m2 = 7.48 m2 

Hence, 7.48 m2 of sheet is required Ans.

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Salim Ahmed Kawsar

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Given,

Base diameter of cylindrical tank = 140 cm

So, radius of tank =\(\cfrac{140}2\) = 70 cm = .70m

Height of tank = 1m

So, area of sheet required for making the tank = TSA

= 2πr(h + r)

= 2\(\times\cfrac{22}7\times\).70 \(\times\)1.7 = 7.48 m2

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