1. Precisionmade 45/90 degree drawing triangle for largescale projects. Ergonomic design with integrated finger lifts for comfortable handling and easy manoeuvrability. 2. Wide application: the rulers with right angles are useful tools for architects, engineers, artists, designers, students, etc. Ideal for students and professionals in architecture, engineering, art, and more. 3. It improves the learning experience for students by providing a precise and accurate method for measuring angles and drawing shapes. This math teaching tool is suitable for those on the go as it is lightweight and easy to transport between classrooms. 4. The construction of this teaching device is robust and reliable, made of solid plastic for a long service life. The clear scale markings on the teaching triangle ruler allow precise measurements and ensure accuracy in all drawings and calculations.