Using our magnetic demonstration tools you can teach the class at the whiteboard or chalkboard with clear shapes. We have 45/45/90 or 30/60/90 degree angles that include bold, easy to read markings, which makes shape drawing even simpler. Geyer's calibration triangles include centimeters and inches. Also has a center cut out and inking edge to avoid smearing your work. All of our options are great for classroom or the office!