The breadth of your books are perpendicular to the length because they meet at right angles.
The shape of a book is a rectangle. A rectangle has four enclosure. This means they are formed by 4 lines.
The opposite sides are equal in length.
The sides of the book has a pair of breadth and a pair of length.
The breadth and length are straight lines.
When this straight line meets, it forms a right angle(90 degrees). This means the breadth and the length are perpendicular to each other.
learn more on perpendicular lines here: brainly.com/question/17351910
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