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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?

Given :
height(h) of the cylindrical tank = 1m
=( $$\frac{140}{2}$$ )cm = 70 cm = 0.7 m

Now, Area of sheet required = total surface of tank

But, we know that,
Area of sheet required
= $$2{\pi}r(r + h)$$ $${m}^2$$
= $$2 × \frac{22}{7} × 0.7(0.7 + 1)$$ $${m}^2$$
= $$4.4 × 1.7$$ $${m}^2$$
= 7.48 $${m}^2$$

Therefore , it will required 7.48 $${m}^2$$ area of sheet.