How to Use a Protractor - Interactive Guide & Calculator

1. Understanding Your Protractor

A protractor is a measuring tool for angles, typically showing measurements from 0° to 180°. The center point (vertex) and baseline are crucial for accurate measurements.

2. Measuring an Angle

• Align the protractor's center point with the vertex of your angle
• Line up the baseline with one ray of the angle
• Read where the second ray intersects the protractor's scale

3. Drawing an Angle

• Draw a horizontal line as your baseline
• Mark a point for your vertex
• Place the protractor's center on the vertex
• Make a mark at your desired angle
• Connect the vertex to your mark