kejia teaching triangular plate set large magnetic plastic protractor compass ruler teacher whiteboard mathematics teaching aids 科加教学三角板套装大号磁性塑料量角器圆规尺子教师白板数学教具

protractor (non-magnetic) protractor (with magnetic) 60 ° teaching set square 60 ° teaching set square (with magnetic) 45 ° teaching set square 45 ° teaching set square (with magnetic) k-200 solid compasses k-300 compasses k-500 compasses (no large round accessories) k-100 ruler k-100-1 ruler (removable) triangular plate set triangular plate set (with magnetic) k-12 five-piece set five-piece set (with magnetic) five-piece removable ruler

regular