Geometric measurement: understand concepts of area and relate area to multiplication and to addition.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 plan figure which can be covered without gaps or overlaps by n unit squares is said to have an area of n square units.