Because that is how a polyhedron is defined.
No. A polygon is a 2-dimensional figure. A polyhedron is 3-dimensional.
NO!!! A triangle is a 2-dimensional shape of three sides; archaically a 'trigon'. A polyhedron is a 3-dimensional solid of many sides.
A cuboid and a pyramid for examples.
cylinder
A polyhedron is a three-dimensional figure formed by flat surfaces that are bounded by polygons joining along their sides (the faces of the polyhedron).A circle is not a polygon, but we can say that a circle is the limit of a regular polygon with n sides. It means that if n becomes larger and larger, the polygon shape approaches to a circle. A circle is a two dimensional figure as a polygon is, but a three dimensional figure whose base(s) is/are a circle cannot be called a polyhedron.
Because that is how a polyhedron is defined.
Because that is how a polyhedron is defined.
A polyhedron is defined as a three-dimensional figure composed entirely of flat polygonal faces, which meet at edges and vertices. In contrast, a three-dimensional figure with a curved surface, such as a sphere or cylinder, lacks flat faces and instead has continuous curves. Therefore, the presence of a curved surface disqualifies such figures from being classified as polyhedra.
A polyhedron.
It is so by definition.
cube
Sphere
312
A polyhedron cannot have curved surfaces; all its faces must be flat, polygonal shapes. Additionally, it cannot have any holes or gaps, as a polyhedron is a solid figure with a continuous surface. Shapes like spheres or cylinders, which have curved surfaces, are also not considered polyhedra.
No. A polygon is a 2-dimensional figure. A polyhedron is 3-dimensional.
NO!!! A triangle is a 2-dimensional shape of three sides; archaically a 'trigon'. A polyhedron is a 3-dimensional solid of many sides.
A cuboid and a pyramid for examples.