Question

How much metal sheet is required to make a closed cylinder of radius 15cm.and height 12cm

Answer 1

Answer:

$given \\ radius(r) = 15cm \\ and \\ height(h) = 12cm \\ we \: have \: total \: surface \: area \: of \: cylinder \: = 2 \pi \: r(r + h) \\ = 2 \times \frac{22}{7} \times 15(15 + 12) \\ = 2 \times \frac{22}{7} \times 15 \times 27 = 2545.71 {cm}^{2}$