2.Development of  a square to hexagon transition piece

Figure 3 shown the development of a square to hexagon transition piece.  The front view , Top view and the true length diagram for half of the transition piece is shown.
The transition piece is assumed to cut along PQ.  Triangles 1-p-a and 1-a-2 and trapezium a-2-3-b are obtained.
To develop the lateral surface a-2-3-b, it is divided in to two triangles by connecting either a-3 or 2-b and completed by triangulation method as detailed in the above problem.

Figure 3. Dvelopment of a square to hexagon transition piece