Question

A rectangular sheet of paper of dimensions 44cm×18cm is rolled along its length to form a cylinder. Find the total surface area of the cylinder so formed.

Answer 1

$dimensions \: of \: sheet \\ l = 44cm \\ b = 18cm \\ this \: sheet \: is \: rolled \: along \: its \: length \: so \\ length \: becomes \: the \: circumference \\ 2\pi r = 44 \\ 2 \times \frac{22}{7} \times r = 44 \\ \frac{44}{7} \times r = 44 \\ r = 44 \times \frac{7}{44} \\ r = 7 \: cm \\ now \\ tsa = 2\pi \: r(r + h) \\ 2 \times \frac{22}{7} \times 7(7 + 18) \\ \frac{44}{7} \times 7 \times 25 \\ 44 \times 25 \\ 1100cm {}^{2}$

Answer 2

Height=44
Breadth becomes circumference hence 2 pie r
R=63/22
T.s.a=2 pie r (r+h)
Solve it answer you will get will be 9/11×1031