Polyhedra (singular = polyhedron).
A polyhedron is a solid object bounded by polygons. Polygons are plane shapes [bounded by straight lines]. The curved surface of a cone is not a polygon and so the cone is not bounded by polygons and therefore, a cone is not a polyhedron.
A triangle is the only polygon with 3 corners (vertices). There is no polyhedron with 3 corners.
You can find a polyhedron with any number greater than 4 of vertices or faces. However, a torus, ellipsoid, sphere, paraboloid, hyperboloid are all standard shapes with no vertices. Cylinders, too, have no vertices. And there are many completely random shapes - a lump of putty, for example, which will have no vertex.
A triangle is not a polyhedron. A triangle is a two-dimensional figure, and a polyhedron is a three-dimensional solid. An example of a triangular-shaped polyhedron is a pyramid.
A polyhedron.
Polyhedra (singular = polyhedron).
It is something that is not a polyhedron. that would includethings which are not shapes, such as concepts (for example a thought, or blue or sour),shapes which have fewer than 3 dimensions,3-dimensional shapes withone or more curved surfaces or edges.
A geometric solid. The answer is NOT polyhedron. A cone, for example, which is a figure made up of the most simple geometric shapes (a straight line) and a circle, is not a polyhedron.
A polyhedron is a three dimensional shape. A polyhedron is bounded by a number (four or more) of polygons and encloses one space.
a polygon(or polyhedron) is a three dimensional figure that has straight edges. * * * * * A polygon is 2 dimensional, a polyhedron is 3-d.
Any polygon, and thence, any polyhedron.
None. A polyhedron is 3 dimensional and you cannot make a 2 dimensional shape out of 3D shapes.
A polyhedron with eight plane surfaces. Source: Answers.com
A dodecahedron is a polyhedron with between 18 and 30 faces.
Polyhedra (plural; singular = polyhedron)
A polyhedron is a solid object bounded by polygons. Polygons are plane shapes [bounded by straight lines]. The curved surface of a cone is not a polygon and so the cone is not bounded by polygons and therefore, a cone is not a polyhedron.