The circle is entirely within 16 squares of size U but does not entirely cover about one unit of area in each of the four corners. Thus, we estimate that area (circle) is close to 12 U. Similarly, we see that area (cycloid) is of about 37 U is a reasonable estimate. Better accuracy is given by the grid of squares of unit area u. The following diagram leads us to the estimated area (circle), approximately 50 u, and area (cycloid) is very close to 149 u :