Formally, a polgon is concave if there is at least one pair of points in (or on) the polyhedron such that the straight line joining the two points is not wholly inside (or on) the polyhedron.
In less formal terms, a concave polygon is one which has a bit going inwards.
No, the sun is very nearly a perfect sphere. It is probably an oblate spheroid, as is the earth.
No, they are the faces of the polyhedron.
The definition of polyhedron. If it was not faceted it would not be a polyhedron.
yes it is a polyhedron
One way which will work for a convex polyhedron is to list the coordinates of each of its vertices. However, this method will not work not non-concave polyhedra of solid shapes which have one or more curved surfaces.
They are the faces of the polyhedron.
No, a cubiod is not a polyhedron but a cuboid is.
Icosikaitetra (not icosikaitera) is an adjective that means 24. The question does not specify whether it is a polygon with 24 sides or a polyhedron with 24 faces. Even if it were known that it was a polygon, there is no information on its shape - it can be convex or concave, small or huge.
Yes, a cube is a polyhedron.
False
False
It is a face of the polyhedron