072

5^2 between 4^2 and 6^2.

You can see many of the "special cases" of triangles involved in this diagram. This diagram basically depicts three areas: A) the greater square, B) the lesser square, C) the area is the same for both the middle square and the circle. Further examination of the difference in degrees yields the origin for the difference between the 360 degree circle and the 365.25 day year.