It's one more.
A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges.
It has eight faces, hence the name octagonal pyramid.
The sides of a pyramid are known in geometry as faces.
The correct name for a 3D triangular pyramid is a 'TETRAHEDRON. It has FOUR(4) faces.
A 3d shape with 5 faces can be a square pyramid
It is a square based pyramid which has 5 faces, 8 edges and 5 vertices
All except the base are always triangles; the shape of the base gives the name to the pyramid; eg a pentagonal pyramid has a pentagon as the base and five triangular faces; a triangular pyramid has three triangular faces and also has a triangle for the base.
A triangular based pyramid with 4 equilateral triangle faces is a tetrahedron
Trapezium, or triangular pyramid * * * * * A triangular pyramid, yes. But not a trapezium since that does not have four triangular faces.
square * * * * * "Pyramid" is the name given to a class of solid (3-dimensional) shapes whose base can be a polygon with any number of sides. All other faces are triangles which meet at the apex of the pyramid.
A pyramid
4 triangles and 1 square
There are a number of possible 7-sided polyhedra. Three that come immediately to mind are: a hexagonal pyramid, a pentagonal prism, a "stretched" triangular pyramid (triangular base, rectangular sides, and then triangular faces meeting at an apex).