With the long edge of your book lined up against your sturdy object, place your ruler down on the flat surface. Then place the short edge of your ruler against the sturdy object, with the long edge flush against the bottom of your book. This will tell you the book's width.
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Explanation:
With the long edge of your book lined up against your sturdy object, place your ruler down on the flat surface. Then place the short edge of your ruler against the sturdy object, with the long edge flush against the bottom of your book. This will tell you the book's width.