A ruler or tape measure would commonly be used to measure the width of a book.
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.
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You measure it.
With a ruler..... hahaha
Millimetres
Height by width and a ruler. :)
the metric system
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.
It depends on what is being measured. The instruments and units used for measuring the length, width and height of a building would be different to those used for a matchbox!
instruments are technically used to enhance are sense to discover new things. Such as a telescope and a microscope.
A centimetre should suffice.
A centimetre, although you could use a millimetre for greater accuracy.
Inches or centimetres are fine for a book's dimensions. Measure the width, height and depth to determine the volume. If you are talking about the length of the book's narrative, word count is probably the most accurate.
-- Measure the height.-- Measure the width at the top.-- Measure the width at the bottom.Area = (1/2) x (height) x (width-at-the-top plus width-at-the-bottom)