7
Nine.
A heptagonal what? Prism, pyramid or something else?
14. And it is better known as a heptagonal prism.
A prism with 9 faces is a heptagonal prism. That has 14 vertices.
Faces = 8 Edges = 14 Corners = 8
A heptagonal prism has two 7-sided bases.
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?
A heptagon has 7 corners.
Nine.
A heptagonal prism has 20 edges.
A heptagonal what? Prism, pyramid or something else?
There can be a heptagonal prism or an octagonal prism, but there is no such thing as a hectagonal prism.
14. And it is better known as a heptagonal prism.
14 vertices
It has 14 vertices
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A prism with 9 faces is a heptagonal prism. That has 14 vertices.