Question

it is required to make a closed cylindrical tank of height 1 m and base diameter 120 cm from a metal sheet how many square metres of a sheet are required for the same

Answer 1

we have h=1m and r=0.6m i.e 6/10

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

2x 22/7x6/10(1+0.6)

=2*17*3*166/175

=6.03cm square