Inches or centimeters
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
Try using a triple beam balance, or a electronic scale. The units to measure the mass of the book would be in grams.
meters2
5 and 1/2 inches is a standard book width. Many are different sizes.
the metric system
Millimetres
Instruments such as calipers, rulers, and tape measures can be used to measure the width of a book. These instruments provide an accurate measurement of the book's width in either inches or centimeters.
A ruler
centimeter
You would typically use inches to measure a paperback book. You can measure the length, width, and thickness of the book in inches to determine its size.
To find the area of a book cover in metric units, the most appropriate unit to use would be centimeters. The formula for finding the area of a book cover would be: length x width.
You measure it.
A centimetre should suffice.
With a ruler..... hahaha
Inches or centimeters
Height by width and a ruler. :)