The first line, not the edge of the ruler.
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On an inches ruler, you start measuring from the edge of the ruler. On a centimeter ruler, you begin measuring from the zero mark.
Whether you are using inches, millimeters, or centimeters, the number you start with on a standard ruler is 0. The idea is to have one number that is always recognized as a starting point.
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.
Oh, dude, not always! Like, if you want to be super precise and follow the rules, then yeah, start from the very bottom of the meter stick. But, like, if you're just eyeballing it or measuring something quickly, you can totally start from wherever you want. It's not like the measurement police are gonna come after you!
You can use the unit of "inches" or "centimeters" to measure a dog's tail length. Using a measuring tape, start from the base of the tail and measure to the tip for an accurate measurement.
You can measure the length or width of a piece of chocolate in millimeters using a ruler or a caliper. Place one end of the ruler at the start of the chocolate and read the measurement where the chocolate ends to determine its size in millimeters.
The metric unit of measurement that would best be used to measure the length of your arm is centimeters. This unit provides a more precise measurement compared to using meters or kilometers for such a small length.