This Mathomat Mathematics Ruler is perfect or taking to maths, geography, art or other classes so you can measure lines or shapes and create perfect circles, ellipses, lines and more. It's a great tool for technical drawing but can also be used in creative applications whenever you need to ensure accuracy in your work. The ruler can be used to draw and rule lines up to 30 cm in length and has both mm and cm markings. It also has a built-in protractor so you can use it to measure and draw any angle. There are geometric shapes you can create with the ruler as well.