Spheres
Circles, squares, rectangles, and triangles are solids that have a flat surface.
2
Cube, rectangular prism
A cylinder
A cube has six flat surfaces, but so do other solids. Look up 'hexahedron' in wikipedia.
true
true
rectangular prisms (including cubes). maybe some other ones I'm not thinking of now too.
No. By definition a polyhedron has to have faces (flat surfaces), edges, and vertices. A sphere, hemisphere, and a cylinder are all solids but are not polyhedra.
Flat surfaces: 6Curved surfaces: 0.
5 flat surfaces.
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).