Circular vs Semi-Circular Protractors: Types, Uses, and Differences #2009705 (License: Personal Use)

The image displays two classic protractor designs: a full circular protractor calibrated from 0° to 360° for measuring complete rotations, and a semi-circular protractor spanning 0° to 180°, commonly used in school geometry. Both feature clear degree markings, center alignment points, and straight baselines for accurate angle measurement. These tools are essential in mathematics education, technical drawing, and engineering workflows.

This image is typically used on educational resource pages, math curriculum sites, or stationery product listings to help students and teachers distinguish protractor types. It serves users seeking to understand tool functionality before purchasing or using them in classroom or drafting contexts.