the use of ruler is for you to line straightly.1 ruler is equal to 1 foot. there are two lines there, the one is centimeters and inches.
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To use a ruler, place the 0 mark at one end of the object you want to measure. Then, read the measurement at the opposite end where it aligns with the ruler markings. Make sure to use the correct units (inches, centimeters, etc.) as indicated on the ruler.
use a ruler
To measure in millimeters (mm), use a ruler or measuring tape with markings in millimeters. To measure in centimeters (cm), use a ruler or measuring tape with centimeter markings. For meters (m), use a meter stick or measuring tape with markings in meters. Simply align the start point of the object you are measuring with the zero mark on the ruler or tape and read the measurement at the endpoint.
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A ruler or a measuring tape can be used to measure a straight sided object. Simply lay the ruler or tape along the object's edge and read the measurement where it stops.
You would likely use a ruler or a measuring tape.