It has 1 circular edge at its base
hemisphere a hemisphere is half of a sphere This is a pentagonal prism
6 edges.
A hemisphere does not have edges or corners. It has only one face. A hemisphere is one half of a circle.
No corners and two edges !
A pentagonal prism will have 15 edges.
I believe it would have nine edges.
12
22
15
Twelve.
8
6 faces, 12 edges