Square centimetres.
Surface area
Square units are used to measure the area of something.
Square units measure area.
The square meter.
Area is a measure of square units.
Area is measured in square units.
kilometer2
Square units measure area.
You would use square centimeters (cm^2) to measure the area of a rectangle that is 34cm in length.
square units
units square= area units= perimeter
None. They are different units. Square units measure area, linear units measure length.