Creative Grids - 45 Degree Triangle Ruler45 Degree Triangle Ruler by Creative Grid Use this 45 degree triangle ruler to cut designs created with eight separate 45 degree triangle units such as KALEIDOSCOPE, DRESDEN PLATE, or CAROUSEL BLOCKS. Cut triangles to a finished height of up to 8 inches to piece blocks that measure up to a finished size of 16 inches. A 1 4 inch dashed line is printed on each side of the center vertical line so you can cut 22 1 2 degree triangles that include the seam