technically it has rectangles, because a rectangle is two sets of parallel lines that connect at 90 degree angles.
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cube
It is not possible to provide any kind of answer without information on the relationship - if any - between the triangle and the rectangle.
Rectangle: length x width triangle: (base x height)/2
No because the rectangle is a longer version of the cube and the cube is a shorter version of the rectangle.
square is rectangle as cube is to rectangular prism