9: the eight vertices of the octagon plus the vertex at the apex of the pyramid.
A octagonal prism has 16 verticies,10 faces and 24 edges.
a pyramid has 6 verticies
an octagonal prisim has, 10 faces ,16vertices ,24edges
An octagonal pyramid has eight sides to it
Verticies are the corners, where edges meet. There are 5 verticies in a pyramid.
An octagonal pyramid has 16 edges.
A square pyramid has 5 faces , 5 verticies and 8 edges
An octagonal pyramid has 9 faces and 16 edges.