# 3.MD.C.5

Recognize area as an attribute of plane figures and understand concepts of area measurement.

**a**
A square with side length 1 unit, called “a unit square,” is said to have “one square unit” of area, and can be used to measure area.

**b**
A plane figure which can be covered without gaps or overlaps by $n$ unit squares is said to have an area of $n$ square units.