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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?

Q : 2    It is required to make a closed cylindrical tank of height \small 1\hspace{1mm}m and base diameter \small 140\hspace{1mm}cm from a metal sheet. How many square metres of the sheet are required for the same?
 

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N Nehul

Given,

Height of the cylindrical tank = h = 1\ m

Base diameter =  \small d = 140\ cm = 1.4\ m

We know, 

The total surface area of a cylindrical tank = \small 2\pi r h+2\pi r^2 = 2\pi r(r+h)

\small = 2.\frac{22}{7}. \frac{1.4}{2}.(0.7+1) = 2.\frac{22}{7}. (0.7).(1.7)

\small = 44\times0.17

\small = 7.48\ m^2

Therefore, square metres of the sheet is \small 7.48\ m^2

 

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