None.
There are none
None normally
it has 0 curved faces
A tetrahedron is a triangular based pyramid that has 4 faces, 6 edges and 4 vertices.
There are no curved edges on a triangular pyramid.
5
There are none
A hexagonal pyramid has one curved surface, which is the lateral surface that connects the apex to the base. The base of the pyramid is a hexagon, contributing six flat surfaces. Therefore, in total, the hexagonal pyramid has one curved surface and six flat surfaces.
None normally
It depends on what type of pyramid. Their is an square pyramid, a rectangular pyramid, a pentagonal pyramid, etc.
0 it only has pointy edges
it has 0 curved faces
The question is ambiguous since a rectangular pyramid and a rectangular prism will have different numbers of flat surfaces. There is no indication in the question which shape is intended.
A pyramid has a combination of flat and curved surfaces, but it typically consists of flat surfaces only. Specifically, a pyramid has a base that is a polygon (flat surface) and triangular faces that connect the base to a single apex, all of which are flat. Therefore, a standard pyramid has no curved surfaces. The total number of surfaces depends on the number of sides of the base polygon; for example, a square pyramid has five flat surfaces (one base and four triangular faces).
A pentagonal prism has 2 pentagonal bases and 5 rectangular lateral faces. The rectangular faces are the only curved surfaces in this context, as the term "curved faces" typically refers to surfaces that are not flat. Therefore, a pentagonal prism has 0 curved faces, as all its faces are flat.
A "rectangular" is an adjective, not a noun and so there is no way of knowing what the shape is. It could be a rectangular 2-d shape, a rectangular pyramid, a rectangular prism and they would all have different answers.
A tetrahedron is a triangular based pyramid that has 4 faces, 6 edges and 4 vertices.