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
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.
2 flat and 1 curved
A square pyramid will not have any curved faces.
2 flat surfaces unless it is rolled up in which case it has 2 curved surfaces.
A cone has one curved surface.
A triangular prism contains zero curved and 5 flat surfaces.
Flat surfaces: 6Curved surfaces: 0.