It is a 2-dimensional sheet that is rolled together and has 2 ends, so it has 2 edges.
However, if the cylinder was a 'planck length' thick [10 to power of -33 cm; in other words extremely thin - as thin as you could get ] it would have no edges since it has no 'locality' ! (And that is a scientific fact - I am not making it up.)
So, if it was 1 planck length thick, how many dimensions would it have - one or two? Think that one through!
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12 edges.
It has 8 edges.
6 edges No, 9 edges
There are zero edges because its a sphere and spheres have no edges
16 edges- the edges of the base, and the edges leading to the point of the pyramid.