7. Digitize polygons 74 and 75 next The two polygons have a shared border. You will digitize one of the two polygons first, and then digitize the other polygon by using the Auto Complete Polygon option. Digitize polygon 75 first. After polygon 75 is digitized, switch to the construction tool of Auto Complete Polygon to digitize polygon 76. You start by left-clicking one end of the shared border with poสygon 75. digitize the boundary that is not shared with polygon 75, and finish by double- clicking the other end of the shared border.