a ruler is used to measure it
and cm, sometimes inches to
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A meter rule.
It is necessary because measuring tools help you measure the length of an object accurately.
To measure a foot length you could use a ruler, a yard stick, a tape measure, or any object that you knew was precisely one foot long on a side or edge.
Use a string: put your finger where the string is at the edge of the object, then use a ruler to measure the tip of the string to your finger. Or use a protractor: each degree equals 1/16 of an inch.
By length width and height