Protractor Diagram - Measuring Angles in Geometry #145258 (License: Personal Use)

This black-and-white line illustration depicts a standard 180-degree protractor with dual concentric scales-inner (0° to 180° left to right) and outer (0° to 180° right to left)-allowing measurement from either direction. The baseline is horizontal with a marked center point “O” for vertex alignment, and fine tick marks indicate single-degree increments with bold numerals every 10 degrees. Designed for clarity and educational use, it supports accurate angle construction and reading in geometry lessons.

Used in math education websites, geometry lesson plans, printable worksheets, and digital learning platforms where students learn to measure or draw angles. Matches user intent for visual reference, classroom handouts, or interactive tools requiring a clear protractor model.