Question

here is the question!
an ant wants to go from A to B but at the same time rotate once around cylinder, what is the shortest way to do that?

Answer 1

maintain a constant angle

Answer 2

ok, I'll ask it in another way, what is the shortest way, I mean how long the way is

Answer 3

try opening the cylinder up , turn it from 3d to 2d

then just use Pythagoras