Using Math Illustrations, a stick model of the container and tray was created to calculate the pivot points and the linkage lengths. Given that two points were needed to move the tray to the desired position, a choice had to be made as to which two points of the tray would be selected. In the first image, I decided to use points close to the endpoints for the calculations. However, looking at the intersection of the perpendicular bisecting lines, the pivot point would have needed to be placed outside of the container. To avoid that, I shortened the length of the link as shown in the second figure which resulted in a pivot point within the area of the container.