Fold Pentominoes from a Loop of Triangles

If you form a loop out of twenty right isosceles triangles, you can fold this loop flat to form any of the twelve pentominoes.

Steps

1. Cut out the two strips of triangles from the pattern sheet and fold creases along the dashed lines.
   
2. Glue the strips together to form a loop of twenty triangles.
   
3. Fold the loop along the creases to form any of the pentominoes.
   

References

• (G. N. Frederickson 2006)