Why books are rectangular in shape?

Answer 1

Though some books are square, most books are rectangular, with pages of greater height than width. While books could be--and sometimes are, for fun--produced in other shapes, the square or rectangular shape makes the best use of the paper, resulting in little waste. Getting the most books from the paper helps minimize the costs.

Answer 2

The rectangular shape of books makes them easier to store on shelves and to handle. This shape allows books to stack neatly and efficiently, maximizing space and ensuring they can be easily organized and transported. Additionally, a rectangular shape provides a practical and functional design for reading and carrying.