Measure and Draw Angles Using a Protractor

Learn How to Use a Protractor

A protractor is a tool used to measure and draw angles. It usually has two sets of numbers — one going from 0° to 180° (outside scale) and another from 180° to 0° (inside scale).

To measure an angle:

• Place the center hole of the protractor at the angle's vertex.
• Align one side of the angle with the zero line on the protractor.
• Read the number where the other side crosses the protractor scale.

To draw an angle, do the steps in reverse — start with one line, measure using the protractor, then mark and connect the second line.

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