It depends on the type of protractor
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You use protractors to measure angles. There is a ruler on the flat edge of most protractors, too. It's very handy!
Protractors
usually they r semi-circular because mostly ques in exams are based on angles between 0 and 180 .But also there are 360 degree protractors but they r usually used by architectures.
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Protractors typically measure angles in degrees. There are 360 degrees in a full circle.