5
An incision is a cut into an object, and pentagonal means five sided, so a pentagonal incision would be a five sided cut into an object.
A pentagonal prism has seven sides.
A pentagonal pyramid has 6 faces.
The pentagonal prism has seven sides including the bases
Five.
5 sides
12 (a dodecahedron)
6
5
I am guessing 6 parelle sides.
Seven :d
Dodecahedron