What is a protractor?

 Shop for Protractor Sets    
 Blue, semi-circle, protractor, 180 degree 

A protractor is an instrument used to measure angles. 

 Mathematical formula, pen, maths lessons, protractors 

You may well have used them in your mathematics lessons.

 "360 degrees" with a blue arrow looping around in a clockwise direction; angles, 360 degrees, protractors; 

Angles are measured in degrees. There are 360 degrees in a full circle.

 Plastic, semi-circle, protractor, angles 

Many protractors are a semi-circular shape made from plastic...

 Several 180 degree angles; angles, 180 degrees, protractors 

...and can measure up to 180 degrees.

 360 degrees, protractor, angles 

However, it is possible to buy protractors which measure up to a full 360 degrees.


In construction, protractors can be found as a part of several tools, including:

 A red Faithfull combination square set; rule, ruler, blade, square head, centre head, protractor head 
  • Combination square sets

 A Mitutoyo bevel protractor; angles, protractor 
  • Bevel protractors

 A protractor and depth gauge; angles, protractor 
  • Protractors and depth gauges

  digital angle gauge with an On/Off button and a "Zero" button; angles, liquid crystal display, magnets 
  • Digital protractors (and angle gauges)

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