Protractor Diagram - Measuring Angles in Geometry and Drafting #224298 (License: Personal Use)

This black-and-white line illustration depicts a classic semicircular protractor with two concentric arcs-inner and outer-each marked from 0° to 180° in 10-degree increments, with finer subdivisions for accuracy. The straight edge at the base includes a central alignment mark, enabling users to position the protractor precisely over vertex points when measuring or constructing angles. Designed for clarity and instructional utility, it reflects vintage drafting tools still used in classrooms worldwide.

Used in educational content (e.g., geometry tutorials, worksheets, and interactive learning modules), technical documentation, and design guides where visual explanation of angle measurement is required; matches user intent for finding reliable, printable, or embeddable protractor diagrams.