we start by assuming if you were to fold and assemble that you'll get a cylander.
The area of the 2 circles is
2*pi r^2
^ this 2 cuzz there are 2
area of rectangle is 2*pi* r that is the circumference
2*pi* r *6 is area
so you add them up and you get
(2*pi* r *6)+(2*pi r^2)