Inches or centimeters
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The metric unit commonly used to measure the length of a book would be centimeters (cm) or millimeters (mm), depending on the size of the book. For larger measurements, meters (m) could also be used. These units provide a more precise and standardized way of measuring length compared to imperial units like inches or feet.
I think I saw that you tried to include that your units were in inches. this is not a metric unit to start. convert inches to centimetres. then multiply the length by the width to get your answer in cm^2, a metric unit
You would typically use centimeters (cm) or millimeters (mm) to measure the width of a book. These units provide a more precise measurement for smaller objects like books.
Try using a triple beam balance, or a electronic scale. The units to measure the mass of the book would be in grams.
meters2
You would use a ruler or a meterstick to measure the length of the strap on your book bag. A yardstick is typically used for larger measurements and may not be as precise for measuring smaller objects like a strap.