Different scientific and practical applications require different protractor configurations. Free Online Protractor features 4 specialized modes tailored for full geometry, drafting, and trigonometry exercises.
1. 360° Full Circle Protractor Mode
Ideal for navigation, bearings, astronomy, and full 360-degree rotation analysis. Displays inner and outer degree scales from 0° to 360° with 1° tick marks.
2. 180° Semi-Circle Protractor Mode
Matches traditional classroom plastic protractors used in geometry courses. Perfect for measuring angles on flat baselines and polygon interior angles.
3. 90° Quadrant Mode
Designed for acute angle precision, elevation angles, incline measurements, and right triangle trigonometry (sine, cosine, tangent calculations).
Key Technical Takeaways
- 360° Mode measures full circular rotations and compass bearings.
- 180° Mode mirrors standard classroom geometry tools.
- 90° Quadrant Mode maximizes resolution for acute incline measurements.