If you were to 'unroll' the cylinder you would find the side is actually ALWAYS a rectangle when flattened out?

Yes

Step-by-step explanation:

It's harder to explain but think logically about it or get or get a piece of paper. Then roll it up in as many different ways that u can think of into a cylinder. If u unroll it then I I'll always be a rectangle  

8+10

step-by-step explanation:

you multiply 4 by 2 and 5 by 2

113.1

step-by-step explanation:

v=4

3πr3=4

3·π·33≈113.09734