None, they have vertices.
no because a polygon can not have curved edges,points,sides,ect.
it has 0 curved edges
it has 0 curved edges
4 edges A rectangle has four edges. A rectangle has 4 sides but no edges which are normally applicable to polyhedrons.
there are no curved edges on any triangle.
There are no curved edges on a triangular pyramid.
There are no curved edges, but it does stack.
A 2D rectangle has no edges but has 4 boundaries, and a 3D rectangle is a rectangular prism and has 12 edges.
There are no curved edges in a pentagon. Part of the definition of any polygon is that they have straight edges.
In 3 dimensions, at least, a cube has no curved edges.
Curved.