Question 16
A checkered - the squared rectangle in the figure is made of 31 segments of $0{,}5~\mathrm{cm}$, and comprises 12 squares. Rosa drew on a rectangular sheet of $21~\mathrm{cm}$ by $29{,}7~\mathrm{cm}$ checkered with squares of side $0{,}5~\mathrm{cm}$, a large checkered rectangle made with 1997 segments. How many squares does this rectangle have? 