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.
Polyhedron is a geometric solid in three dimensions with flat faces and straight edges.
simlar polyhedron
geometric solid
A polyhedron is a solid shape with many sides. The word "polyhedron" does not specify a number of sides.
A polyhedron is a solid shape with four or more polygonal faces. A hexahedron is a solid shape with six polygonal faces and so is a particular type of polyhedron.
A cube is a solid figure called a polyhedron. A polyhedron is a solid figure with all flat faces. So a cone would be a solid figure but not a polyhedron becasue it has a curve and does not have all flat faces.
NO!!! A triangle is a 2-dimensional shape of three sides; archaically a 'trigon'. A polyhedron is a 3-dimensional solid of many sides.
Each polyhedron is a kind of solid object. Some solid objects -- for example, a sphere or a torus -- are not polyhedra, but every solid object can be closely approximated with a polyhedra.
A polyhedron.
A face.
A polyhedron is any 3D solid (such as a cube) - therefore, it can have any number of faces.
No, because a polyhedron is a solid with many flat faces. A heptagon is not a 3-D figure. However, a pyramid or prism would be a polyhedron.