Do you mean "two-dimensional right angles?" If so, then each side of a cube is a square and so has four right angles.
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No because a cube has only 4 right angles on each of its six faces.
Right (90o)
There are none because a square is made out of right angles, and a cube's faces are made out of squares.
They both have right angles, they both have sides of the same length (yes, on a cube, edges of the same length).
Yes