Drawing Tools: With a measuring angle range of 0 to 100 degrees, you can easily and quickly measure objects using this protractor for math lessons and school supplies. Angle Measuring Ruler: Helps you work efficiently and on time with drawing and measuring; this plastic protractor is very useful. Math Protractor. Angle Protractor: Using half-angle protractors, you can draw various beautiful and practical patterns such as circles, etc. Protractor for Students. Protractor for Math Lessons: Suitable for most students, helping with math and other subjects; also suitable for teachers. Half-angle protractor. Protractor Accessory: Good workmanship, smooth surface, no burrs or sharp edges; you can use these math protractors with peace of mind. Protractor for Students.