This keeps the end of the cut neat. Sometimes you can tear ... in strokes from the fold line out towards the paper's edge - this prevents the strips from scrunching. Take your time to make the ...
Using a paper trimmer, cut the paper into strips with a 1 inch width. For each heart, you will need 6 strips; two 5 inch strips, two 6 ½ inch strips, and two 8 inch strips. To make larger sized ...
Trihexaflexagon is constructed by cutting a strip of paper so that it may be marked off in 10 equilateral triangles (A). The strip is folded backward along the line ab and turned over (B).