an L-square, a T-square, or a protractor
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A protractor is used to draw a right angle of 90 degrees.
I generally use a pencil and ruler. To construct the right angle to draw it I also use compasses. To measure the right angle to draw it I also use a protractor.
A compass is a geometric tool used to draw circles.
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A protractor is the common tool used in mathematics for measuring and drawing angles.