A protractor is any of several devices used to either define an angle or curve, or to draw an angle, curve, or shape.
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go to this link. it has a small video: http://www.mathsisfun.com/geometry/protractor-using.html
A protractor, a compass, a ruler, and a straightedge
A protractor, a straight edge and a compass
Scale, protractor,compass,divider,set square
Although it varies by kit, the general ones are. A protractor, a compass, a ruler, and a triangle, and or a stencil