The measurement of an area is the comparison of the area SF of a given figure F with the area of a square with a side of the unit length. The result of the comparison is a number, the numerical value of the figure's area, which shows how many times the area of the figure F is greater than that of one unit square. Figures that have the same area are called equal in areas.
In the movie a square with the side of length a is painted in blue and a circle with radius of a is painted in red. The circle area is πa2 and the square area is a2. Red paint consumption is π times greater that blue paint consumption. The area of a circle with a radius of a is π times greater that the area of a square with a side of a.