A cuboid (rectangular prism) is the only shape with 6 rectangular faces (3 pairs of rectangles in fact). A cube is a special type of cuboid where all the rectangles are squares. Both cubes and cuboids are special types of hexahedron (polyhedrons with 6 faces).
The only shape with 6 equal rectangular faces is the hexagonal prism. However, since it also has two hexagonal faces it is therefore an irregular octahedron rather than a hexahedron.
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If the length of the sides is the same throughout, then it is a CUBE.
If the length of the sides varies , then it is a CUBOID .
A rectangular prism.
A hexagonal prism
A rectangular prism (like a brick).
rectangular prism
A cuboid can have 6 rectangular faces, 12 edges and 8 vertices