Question

i dont know how to do this

Answer 1

The formula of a surface area of a cylinder:
$S.A.=2\pi r(r+H)$

We have:
$r=1m;\ H=10m$
substitute:
$S.A.=2\pi\cdot1\cdot(1+10)=2\pi\cdot11=22\pi\ m^2\approx22\cdot3.14=69.08\ m^2$