The 2cm on each side add to the height. So new height would be 17+4=21=h.
d=R/2 so radius is 14cm.
2*pi*R*h. use this formula. Take pi as 22/7 it divides with 14 and 21
so you get 1848cm2.
Also, 1.5cm2 cloth is also wasted in cutting and pasting, so add that. You get 1848+1.5=1849.5cm2
Hope this helped