Hi,

  I need help regarding this question as soon as possible.

Conventionally a cylindrical face addressed differently in topology.

It has one face and two edges – this means going by the number of the faces it should have only one loop whereas  going by the edges it should have two loops , which outer and not connected,. Thus the representation has two loops. But the question is how to differentiate between the two loops because both qualify as outer?

The question is, how to differentiate both two loops.\

i am giving some snaps of the part.

as there is a single cylindrical face in the figure, the single face should have onlu one outer loop, but figure shows it is having two outer loops in figure1 and figure2

figure1

fogure2

then how can i explain and differentiate that the single face has two outer loops?.....could you please give me the answer...............thanks in advance.