Not all books are rectangular.
Of those which are, some are in the more usual portrait format, while some are in the landscape format.
Some are square, oval and various other shapes.
However, the general reason for the majority of books being the rectangular shape they are is simple ergonomics - it makes them easy to hold in two hands in front of the face.
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Shoe boxes, CD cases, books.
Books, boxes, notebooks, and basically every three-dimensional figure with rectangular sides.
Rectangular is an adjective, not a noun so there is no such thing as a rectangular. You an have a rectangular lamina, a rectangular pyramid, a rectangular prism, a rectangular antiprism and they all have different solid shapes.
A rectangular prism.A rectangular prism.A rectangular prism.A rectangular prism.
They are both rectangular.