polyhedron
An irregular polyhedron if it has plane faces. If not, then there usually will not be a name for it.
3d shapes with plane faces are called polyhedra (singular = polyhedron). The minimum number of vertices is 4, there is no maximum.
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
A polyhedron is a solid figure with many plane faces, usually greater than six. A polyhedron that has 7 faces is called a heptahedron.
Any polyhedron.
An icosahedron is a polyhedron has 20 faces, and is a 3D shape.
polyhedron
None. A polyhedron is 3 dimensional and you cannot make a 2 dimensional shape out of 3D shapes.
Any polyhedron.
An 8-faced 3D shape is called an octahedron. It is a polyhedron with eight triangular faces, 12 edges, and six vertices.
It cannot be a polyhedron nor any "normal" 3d shape.
A diamond is a 3D shape, specifically a type of polyhedron known as a rhombus. A rhombus is a quadrilateral with all sides of equal length, opposite sides parallel, and opposite angles equal. In a three-dimensional space, a diamond shape is a polyhedron with four faces that are congruent rhombi.
The faces in a 3-D shape (polyhedron, for example) are bordered by edges.
An irregular polyhedron if it has plane faces. If not, then there usually will not be a name for it.
3d shapes with plane faces are called polyhedra (singular = polyhedron). The minimum number of vertices is 4, there is no maximum.
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.