Protractor Diagram - Educational Tool for Measuring Angles #2009251 (License: Personal Use)

This black-and-white line illustration depicts a classic 180-degree protractor with evenly spaced major and minor tick marks, labeled in 10-degree increments and fine subdivisions for accuracy. The baseline includes a central alignment mark and a straight edge for positioning against lines or rays. Designed for clarity and educational use, it supports both inner and outer scale readings depending on angle orientation.

Used in K-12 math curricula, geometry textbooks, online learning platforms, and printable worksheets to teach angle measurement; matches user intent for visual reference, classroom handouts, or DIY drafting guides.