I recommend this tape for marking the angled lines for the Squedge Tools.
Select the color you prefer and apply tape over the desired measurement on back of ruler, then trim even with ruler edge When cutting strips, automatically look for the highlighted line or area, preventing the common mistake of cutting the wrong size.
Made by Omnigrid
Packages contains 3 colors: pink, yellow and orange
Video: Watch 1 minute 20 seconds into the Squedge March video for a great tutorial on how to make the center applique for any project. This one is small for the Squedges but can be used for any applique. (Squedge March video is the 8th video on the Squedge Video Page)