Description: Math Teacher Aids: Large size ruler for geometry drawing and math lessons, suitable for classroom, school or officeLarge Numbers: Math geometry ruler has clear large numbers on it, easy for you to measure and read, suitable for chalkboards, whiteboards, erase boards and moreEasy to Use: Teaching ruler is lightweight and easy to hold, ideal drawing aid for teachersMaterial: Drawing math geometry tool is made of woodmaterial, strong and sturdy, wear resistant, not easy to deform, won't scratch your handWidely Used: Math geometry teaching supplies are essential tools for architects, engineers, artists, designers, teachers and more Size Chart: Protractor:length60cm or 23.62inchCompass:length50cm or 19.69inch45 triangle:length53cm or 20.87inch60 Degree triangle:length54cm or 21.26inch Package Includes: 1 Protractor Note: Please allow slightly errors due to manual measurement and different monitors.