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Faces on solid figures are like when you look at a square you see a flat wall type surface.
look at ask or google to find an answer * * * * * A polyhedron with equilateral triangular faces is called a deltahedron. There are infinitely many of them but only 8 convex ones. The following three are regular: tetrahedron, octahedron and icosahedron. There are 5 more convex polyhedra which are convex but not regular (because they have differing number of faces meeting at their vertices) These are Johnson deltahedra (see link).
It can have. There are 257 different octahedra and some of them have rectangular or square faces. See the attached link for some of the 257.
Yes and no, depending on what restrictions you're working with: If it is an opaque closed box, and is being drawn with correct perspective, then no. The most faces that can be "seen" like that is three. If it is an open box, (ie. one side missing), then it can be drawn with correct perspective to show 4 faces. If it is a wire frame box, then it can be drawn in such a way that allows you to see all six faces. If you are drawing without perspective, then you can put the faces together in such a way to allow 4 to be visible. If the box doesn't need to be assembled, then it could be drawn out as a flattened group of segments that would fold together into a box, allowing you to see all 6