Protractor - Blackboard - Plastic - 0-180°This large plastic blackboard protractor offers clear, bold angle markings and is specially designed for demonstrating angles on classroom whiteboards or blackboards. Measuring from 0 to 180 , it allows teachers to model geometry, trigonometry, and measurement concepts in a highly visual way. Made from durable plastic, it is lightweight, easy to handle, and an essential teaching aid in any maths classroom. The large format ensures visibility even in