Line up the vertex, then if it is an acute angle use the small number, obtuse use the big number, next all you have to do is bring your finger up to where the angle line is and see what number, big or small it lines up with on the protractor!
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Use a protractor and the 4 interior angles should add up to 360 degrees.
Use a protractor.Use a protractor.Use a protractor.Use a protractor.
A protractor.
There are three angles in a triangle but to measure them you would use a protractor.
A protractor is used to measure angles.