To bisect an angle using paper folding, fold the paper through the angle so that the line segments determining the angle lie:

To bisect an angle using paper folding, fold the paper through the angle so that the line segments determining the angle lie ON EACH OTHER. 

To bisect means to divide into two equal parts and to find the middle line of the shape or angle. Simply fold the paper using the written lines of an angle. Each line must lie on each other, flatten the paper and the crease formed will be the bisecting line. 

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