Heptagonal is an adjective, not a noun! The answer will depend on whether you mean a heptagonal pyramid, a heptagonal bipyramid, a heptagonal prism or whatever.
A heptagonal what? Prism, pyramid or something else?
8. There are 7 vertices on the heptagon, and 1 vertex for the top of the pyramid.
7
Nine.
Heptagonal is an adjective: the answer depends on the noun that it refers to. A heptagonal pyramid, a heptagonal dipyramid or a heptagonal prism or some other heptagonal shape?
Heptagonal is an adjective, not a noun! The answer will depend on whether you mean a heptagonal pyramid, a heptagonal bipyramid, a heptagonal prism or whatever.
there is 13 edges in a heptagonal pyramid.
A regular octahedron and a heptagonal pyramid.A regular octahedron and a heptagonal pyramid.A regular octahedron and a heptagonal pyramid.A regular octahedron and a heptagonal pyramid.
a heptagonal pyramid has 8 faces
A heptagonal prism has two 7-sided bases.
A heptagonal what? Prism, pyramid or something else?
hexagonal pyramid
Yes.
A heptagonal based pyramid has: 8 faces 8 vertices & 14 edges
8. There are 7 vertices on the heptagon, and 1 vertex for the top of the pyramid.
A Heptagonal Prism