Question

The capacity of a closed cylindrical vessel of height 1m is 15.4 liters . How many square meters of metal sheets would be needed to make it .​

Answer 1

volume of the cylinder=15.4litres

πr²h =15400m³

so, 22/7×r²×1m = 15400m³

so, r²= 15400m³×7/22×1/1m

r²=4900m²

so, r=√4900m²

radius=70m

now, area of sheets required to make cylinder= total suface area the cylinder

=2πr(h+r)

=2×22/7×70(1+70)

=31,240m²

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Answer 2

total surface area of cylinder =

31,240cm²