Circular Protractor Diagram - Educational Tool for Angle Measurement #3241461 (License: Personal Use)

This black-and-white illustration depicts a standard 360-degree circular protractor with two concentric arcs marked from 0° to 180° in opposite directions, enabling bidirectional angle measurement. Fine tick marks indicate single-degree increments, with bold numerals every 10 degrees for clarity. The central horizontal baseline serves as the reference line for alignment during use.

Used in educational settings (math/geometry classes), technical drawing, engineering schematics, and DIY projects where accurate angular measurements are required; matches user intent for learning tools, printable resources, or visual references.