A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges.
7 vertices
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7 vertices
A triangular pyramid has 4 vertices. A retangular and square pyramid has 5 vertices. A pentagonal pyramid has 6 vertices. A hexagonal pyramid has 7 vertices.
A hexagonal pyramid has 12 edges, 7 vertices and 7 faces.
Subtract 1 from the number of vertices. Find the name of the polygon with that many sides. The pyramid has that polygon as its base. So, for example, 7 vertices. Subtract one and that gives 6. A six sided polygon is a hexagon. So the shape is a hexagon based (or hexagonal) pyramid.
A triangular based pyramid has 4 vertices, 6 edges and 4 faces