When all six faces are squares it looks ike the following .
It is a rectangular prism because a square has only right interior angles and if a straight line is perpendicular to two interesting straight lines, lying in a plane,
then it is perpendicular to this plane. Thus, all faces will be rectangles, a square is a particular case of a rectangle.
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Dear Rito, we are sure that it is a rectangular prism.
Can you be sure that it is a actually a rectangular prism? If you think you cannot be sure, explain why
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