Answer: 15CM
Answer: They come in different sizes, actually. Sizes between 20 and 30 centimeters are fairly common.
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There is no set length for a ruler, as they are produced in various sizes. The more common sizes are 15 cm, 30 cm and 100 cm There are two main methods to see what size your ruler is; a) Find another one that is longer than your own and measure the the length of yours using that one b) Look at the scale on your own ruler. The largest number there indicates the length.
you measure the length of AA pencil or a pen in cm
The old Imperial ruler was one foot long. To enable pupils to carry one in their "pencil box", a version that was half as long was introduced. 1 foot = 30.48 cm so rulers are graduated to 30 cm or half that length (= 15 cm).
15 cm. You just need to measure it. don't you have a ruler? No offense or anything. Hope this helps!
100 cm