Triangler Ruler ANK 307 The Triangler - A Kaleidoscope shaped ruler. Designed to go with our Angles with Ease book. See the pictures below to see the projects from our book that are made with this ruler. Use our ruler to cut trees, diamonds, hexagons, tumblers, hourglass blocks and more. You can also use the ruler to cut form strip units to make paddlewheels, pieced stars, pinwheels and octagons.