I took a class from a noted national teacher who had designed a set of rulers that worked together to cut very wide strips. When students asked her if she wouldn't put out a shorter 12-inch ruler she touted that she would not as her rulers were not designed to "work that way." She later did produce this very ruler, and I have used it a great deal in my work. Rulers may be designed for one purpose, but should not be so limited as this instructor saw them. I often use rulers designed for one purpose to meet another need.
I have had to cut more trapezoids as my color selection was getting too thin and needed to add some more so that what I had cut was able to be used. I chose to use this EZ International ruler made to cut diamonds to make my diagonal cuts easily. I used freezer paper taped to the ruler so that the ruler could be aligned with the strips that I cut. The ruler was rotated for angle and straight cuts along the strip.