Question

A closed cylindrical tin of radius 7 cm and height 12 cm is made from a sheet of metal. Hos much sheet of metal is required

Answer 1

sheet of metal required= area of triangle
$a = 2\pi \: rh \: + 2\pi {r}^{2}$


2πr(h+r)= 2×22/7 ×7(19) = 44×19= 836