Learning Advantage Dry Erase Magnetic Measurement Set Whiteboard Compass, Protractor, Ruler And Triangles TEACH STEM--The set includes two Triangles, a Straight Edge Ruler, a Protractor and a Compass. These timeless tools help teachers get the most out of their students by ensuring the whole class can see the math and geometry being taught USEFUL MAGNETIC DESIGN--The magnets on our measuring tools are perfect for use on dry erase boards to ensure accurate shapes and lines are drawn. The compass does not contain magnets but can hold markers or chalk for use on white boards or chalkboards BIG SIZES, BIG CONCEPTS--Our magnetic measurement tools will make teaching angles and shapes a breeze. The Protractor is marked to 10 along the straight edge, Compass legs measure 17 long, the Straight Edge is 24 long and the hypotenuses on the 30/60/90 Triangle and 45/45/90 Triangle measure 22.05 and 22.83 respectively GREAT FOR GEOMETRY--This Math Set and Geometry Set was originally designed by experienced math experts ensuring all tools needed are included for teachers and students from kindergarten to high school and beyond