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My math book is about 11 inches in length and 9 inches wide.
I would measure it with a ruler.
The length of a math book can be defined in two ways: the physical length of the book or the number of pages contained in the book. In the first case, the length of the book would usually be considered the distance from the top edge to the bottom edge of the book and this would vary depending on the specific book you were considering. In the second case, you could open the book to the last page and examine the final page number and use that as the number of pages.
I have a quick introduction to calculus book that is about 60 pages long. I have another calculus book that is nearly 600 pages long. Clearly the length of a math book may vary depending upon the depth of coverage and the subjects included.
What does length mean in math