Yes, it is.
If it is a simply connected polyhedron then it is a quadrilateral based pyramid and so has 5 faces.If it is a simply connected polyhedron then it is a quadrilateral based pyramid and so has 5 faces.If it is a simply connected polyhedron then it is a quadrilateral based pyramid and so has 5 faces.If it is a simply connected polyhedron then it is a quadrilateral based pyramid and so has 5 faces.
It is a polyhedron with a pentagonal base. To every side of the pentagon are attached triangles that meet at a single point in a plane higher than the pentagon (if it is a skew pyramid, the apex will not be above the pentagon).
It is a Pentahedron.
Yes when in the form of a tetrahedron which is a triangular based pyramid
Yes, it is.
If it is a simply connected polyhedron then it is a quadrilateral based pyramid and so has 5 faces.If it is a simply connected polyhedron then it is a quadrilateral based pyramid and so has 5 faces.If it is a simply connected polyhedron then it is a quadrilateral based pyramid and so has 5 faces.If it is a simply connected polyhedron then it is a quadrilateral based pyramid and so has 5 faces.
It is a polyhedron with a pentagonal base. To every side of the pentagon are attached triangles that meet at a single point in a plane higher than the pentagon (if it is a skew pyramid, the apex will not be above the pentagon).
A pentahedron (eg square based pyramid) or a hexahedron (cuboid), or a heptahedron (a pentagon based prism). There are other shapes.
It is a Pentahedron.
It is a pentahedron
A square pyramid has 5 sides.
It is a tetrahedron = a triangle based pyramid.
There are infinitely many polyhedra. There is no limit to the number of faces that a polyhedron can have. Given any polyhedron, simply cut off one vertex so that you will have a polyhedron with one more face. Also there are several versions of polyhedra with the same number of faces. A hexahedron, for example, can be a parallelepiped or a pentagon based pyramid or a triangular based dipyramid.
A pentagon-based pyramid
It is a triangular based pyramid
Yes and a triangular based pyramid is a tetrahedron