Isosceles triangles are three-sided shapes with two sides the same length. Eight isosceles triangles sewn together form an octagon. Sew Half Square-3" Finished Triangles (55009) to the corners of this octagon it becomes a Kaleidoscope block. Sew several blocks together and play with the colors and you can create a stunning quilt with optical illusions of circles! Another great way to use this die is to cut lots of isosceles triangles from scraps for a Thousand Pyramid quilt. Die packaging includes project directions for a Triangles To GO! decorative pillow.