A metric ruler
The first line, not the edge of the ruler.
30 centimeters
i come form New Zealand and we use metric and I'm guessing we use it just like an imperial one but with metric units on it instead of imperial ones. Like with cm,mm etc instead of inches,feet etc.
You would show 13 centimeters.
Here you find inch and centimeter rulers. Scroll down to related links and look at "Inches and centimeters in comparison".
An ordinary ruler.
A normal metric ruler!
If the ruler only has inches and millimeters, just use the millimeters side. Remember, there are 10 millimeters in 1 centimeter.
A ruler is usually divided by: inches, centimeters, and millimeters.
Get a ruler marked in centimeters and millimeters, anywhere basic school or business supplies are sold.
A metric ruler is use to measure centimeter and millimeters.1 centimeter (cm) = 10 millimeters (mm) .
1cm(centimeter) = 10mm (millimeter) The calculation can be expressed: 26/10=2.6
The millimeters on a ruler are the tiny lines in between each centimeter
It is a linear length and as a ruler it is not round.
The first line, not the edge of the ruler.
A ruler ?
30 centimeters