a millimeter
Millimetres
A square nanometer.
Centimetre
meters
Metres.
Micron
Meter
no clue sorry by.
On a ruler using the metric system, you would typically find units such as centimeters and millimeters. These units are used for measuring length and are based on powers of ten for easy conversion. The metric system is widely used in many countries around the world.
Any metric unit would do. But it might be easier to pick something smaller than the length of the pencil, like a centimeter, or a millimeter.
usually kilometers
It's gonna be inches/centimeters.