Protractor

usgb/prəˈtræktər,prəʊˈtræktər/
noun

A tool used to measure angles in degrees.

Using a protractor, she measured the angles of the triangle.
Visual representation of "protractor" - A tool used to measure angles in degrees

Often appears as...

  • use a protractor
  • read a protractor

Usage tips

Technical

Definition 1 of 1
Visual representation of "protractor"
LampPro Tip 1/3

Math Instrument

A protractor is specifically used in mathematics or drawing to work with angles.

Illustration for Math Instrument
We used a protractor in geometry class to draw precise angles.
LampPro Tip 2/3

Semi-Circle Shape

Protractors are commonly semi-circular but can be full circles, called 360-degree protractors.

Illustration for Semi-Circle Shape
For a full rotation, we needed a 360-degree protractor.
LampPro Tip 3/3

Measurement Unit

Protractors measure angles in degrees, a unit for measuring the size of an angle.

Illustration for Measurement Unit
The protractor showed that the angle was 45 degrees.
Visual representation of the word "Protractor"

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