There are many instruments to measure lengths. But selection of measuring device depends on the maximum length it can measure. For example a small ruler used in schools can measure maximum 15 centimeters (or 6 inches).
Here is a list of some measuring devices for measuring length:
1. Ruler (also known as scale) max 30cm
2. Meter Rod (that used by tailors or cloth sellers), max 100 cm
3. Measuring Tape (used by surveying engineers)
For measuring very large distances travelled,
In vehicles, speedometers also have distance measuring display. Ships use knots for measuring nautical miles.
we don't use length. we use liter.
Yes, a meter stick can be used to measure length.
I would use a centimetre to measure the length of a boy. Not sure what a boy yard is, though.
To measure length
A metre.
To measure a length(one dimensional) of something we can use meters.
You would use meters.
I would use feet
A metres, for an approximate measure, a centimetre for a more accurate measure.
You can use a ruler or a tape measure to measure the length of a test tube. Simply place the test tube on a flat surface and align the ruler or tape measure along its length to get an accurate measurement.
We can use either meter or centimeter to measure a rectangle. For a large area of rectangle we can also use "feet" or " yards". Using "meter" is a convenient form to measure the length of the rectangle.
cm