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protractor - measure the angles

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Set square -providing a straightedge at a right angle or other particular planar angle to a baseline.

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Set squares are used for drawing perpendicular and parallel lines,

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(Set squares) are commonly used; Where there are two types of them; One is 45 degree angles, one is 30-60 degrees, the third angle at each right angle is 90 degrees, use a 45 degree triangle from drawing perpendicular lines, and with this, areas can be parallel lines, perpendicular lines, create a new project.