Depends
polyhedron
A polygon is a flat figure, like a square. A polyhedron is a 3D figure, like a cube.
a polyhedron is any 3d figure with all flat polygons for sides(polygons have straight sides)
A polyhedron is a solid figure with many plane faces, usually greater than six. A polyhedron that has 7 faces is called a heptahedron.
A polyhedron.
polyhedron
The side that is curved, when placed by itself (without bending or manipulating in any way), is not a polygon, making the shape not entirely made of polygons. A 3D figure must be made by only polygons to be a polyhedron.
An icosahedron is a polyhedron has 20 faces, and is a 3D shape.
Any polyhedron.
A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.
NO a cone is not a polyhedron as it has a curved surface. Similarly sphere and cylinders r 3D but not polyhedrons
A polyhedron is any 3D solid (such as a cube) - therefore, it can have any number of faces.