A set square? Only good for 30, 45, 60 amd 90 degree angles, though.
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A protractor is the common tool used in mathematics for measuring and drawing angles.
to measure angles.
A try square is a metal ruler which is attached at right angles to another piece of metal, which looks like a triangle and is often used for drawing angles. A set square is a try square with an adjustable slide.
A pair of compasses.
A protractor is a geometric tool that is used to measure the degree of angles.