No.
No.
Octagonal prism.
A polyhedron that has 2 congruent faces is a PRISM. To be a prism, all the other sides (not including the 2 that are congruent) have to be 4-sided.
yes there are congruent because of the shape * * * * * Wrong. The faces may me congruent but don't have to be. Think of a brick (a rectangular prism). Its top and side are certainly not congruent. And there is no requirement, in such a prism, for the top and bottom to be congruent either.
Look at the prism. If all faces are rectangular (or square) then so are the bases. Otherwise they are the two congruent parallel faces that are not rectangular. Look at the prism. If all faces are rectangular (or square) then so are the bases. Otherwise they are the two congruent parallel faces that are not rectangular. Look at the prism. If all faces are rectangular (or square) then so are the bases. Otherwise they are the two congruent parallel faces that are not rectangular. Look at the prism. If all faces are rectangular (or square) then so are the bases. Otherwise they are the two congruent parallel faces that are not rectangular.
Not necessarily.
octagonal prism and decahedron
octagonal prism and decahedron
According to my calculations, I am a complete nerd, and the answer to your question is 0, there are no 90 degree angles in an octagonal prism.
Rectangular prism
That all depends on the type of faces a prism has. Then, you should have at most 3 pairs of congruent faces on the opposite sides of the prism.
Cube