It could be a triangular prism or a quadrilateral based pyramid.
pentagon
the flat surfaces of a solid figure are the
One of the figure which has no flat surface is Sphere.
A SPHERE has no vertices and no FLAT surfaces
What figure has 6 flat surfaces that all look exactly the same
A sphere.
5 flat surfaces.
There are 5 flat surfaces.
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
A cylinder
cylinder
A cube