This fits your .
With hollow center: the student triangles are easy to grip;
The hollow center of 45/ 90 degrees triangle is a protractor and the other is a interesting hollow drawing pattern
Wide application: the rulers with right-angle are useful tools for architects, engineers, artists, designers, students, teacher, etc.
BronaGrand Large Triangle Ruler Square Set 30/ 60 and 45/ 90 Degrees Set of 2 - B01MDTEITN