Protractor Diagram - Measuring Angles in Geometry #224310 (License: Personal Use)

This black-and-white line illustration depicts a standard 180-degree protractor with concentric inner and outer degree scales, allowing measurement of angles in both clockwise and counterclockwise directions. The baseline is centered at point O, facilitating accurate vertex placement when measuring or drawing angles. Fine tick marks indicate 1° increments, with bold numerals every 10° for readability.

Used in educational resources, math textbooks, online geometry tutorials, and classroom handouts to teach angle measurement; matches user intent for visual reference, printable worksheets, or digital learning tools.