- Easy to use: The teaching ruler is lightweight, fits comfortably in the hand, and serves as a reliable drawing aid for teachers. It is portable, suitable for teachers and students, and makes a thoughtful gift for children. - Wide application: A versatile mathematical tool set for architects, engineers, artists, designers, teachers and more. - Mathematics ruler: The math ruler for drawing and math lessons, suitable for classroom, school or office. Sizes: right angle ruler 57 cm x 33 cm (22.44 in x 12.99 in); 45 degree ruler 56 cm x 40 cm (22.05 in x 15.75 in); protractor 50 cm; compass 43 cm x 41 cm. - Clear numbers: Measurements printed with clear numbers for easy reading on chalkboards, whiteboards, blotting boards and more. - Use scenarios: Classroom geometry demonstrations and board work; drafting and layout in architecture, engineering, or design projects; home study, art projects, and DIY tasks requiring precise measurements and angles.