Yes, it is.
octahedral
no because they don't have the same sides or vertices as the regular ones which are tetrahedral, octahedral, dodecahedral, icosahedral, they are all regular polydrons but not decahedral
It can be, but need not be.
It is not a regular polyhedron because it has unequal sides
No it's not. There are only 5 regular polyhedra, and none of them has 10 sides.
No. It is a semi-regular polyhedron. Explanation. The truncated icosahedron is a polyhedron that can be constructed from an icosahedron with the 12 vertices truncated (cut off) such that one third of each edge is cut off at each of both ends. This creates 12 new pentagon faces, and leaves the original 20 triangle faces as regular hexagons A regular polyhedron is a polyhedron whose faces are congruent regular polygons. The truncated icosahedron is NOT a regular polyhedron, it is a semiregular polyhedron. It is a uniform polyhedron.
No, a sphere is not a polyhedron.A polyhedron is a three-dimensional geometric figure whose sides are polygons.A regular polyhedron is a polyhedron whose faces are all congruent regular polygons.
The sides of a rectangle are not all equal so a rectangle is not a regular polygon. And, as a consequence, any 3-dimensional shape made from rectangles cannot be a regular polyhedron.
An octahedral void is called "octahedral" because its shape resembles an octahedron, which is a polyhedron with eight triangular faces. In a crystal lattice, these voids are formed at the center of an octahedral arrangement of atoms, where six atoms are positioned at the corners of the octahedron. This geometric configuration allows for efficient packing and coordination of atoms in a crystalline structure. The term reflects both the shape and the spatial arrangement of the surrounding atoms.
No, it is not.
No.
No. A polyhedron is 3 dimensional. You have a regular polygon, regular because the sides are equal. If you asked about 20 surfaces, then it would be a polyhedron.