STEPS OF CONSTRUCTION (i) Draw a ray OA. (ii) With O as centre and a convenient radius, draw a long arc, cutting OA at P. (iii) With as centre and the same radius as above, draw an arc, cutting the previous arc at Q. (iv) With Q as centre and the same radius, draw yet another arc, cutting the arc drawn in Step (ii) at R. (v) Join OR and produce it to a point B. Then, angleAOB is the required angle of measure 120^(@).
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