A 3D shape with 21 faces is called a "icosahedron" if it has 20 triangular faces, but if we consider a more general polyhedron with 21 faces, it can be referred to as a "polyhedron with 21 faces." There isn't a specific name for a polyhedron with exactly 21 faces, as many configurations can exist depending on the arrangement and types of faces. Generally, polyhedra are categorized by the number and types of faces they have.
It is called an endacehedron.
pentacontahedron
A decahedron.
It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.
According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.
It is called a decahedron.
It is called an endacehedron.
pentacontahedron
A decahedron.
It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.
According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.
well. it is called icosahedron
That 3D shape is called triangular pyramid.
It is called a Triacontakaidigon.
CUBOID
A three-dimensional figure with 30 faces is called a triacontahedron.
A tetrahedron, also called a pyramid is a three-dimensional shape with four faces.