Follow the following step to construct 120 Degree Angle
1). Use Ruler and draw a Line segment BC of any convenient length. (as shown below)
2). Now use compass and open it to any convenient radius. And with B as center , draw an arc which cuts line segment BC at Q . (as shown below)
3). Again use compass and opened to the same radius (as of step 2). And with Q as center , draw an arc which cuts first arc at R . (as shown below)
4). Again use compass and opened to the same radius (as of step 2). And with R as center , draw another arc which cuts first arc at P . (as shown below)
5). Join BP and extent it to A . (as shown below)
6) Above formed angle ABC = 120 Degree
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