Q5. Construct with ruler and compasses, angles of the following measures:
(d) 120o
The steps of construction are:
1. Draw a ray OA
2. Taking O as the centre and convenient radius, mark an arc, which intersects OA at P.
3. Taking P as the centre and same radius, cut the previous arc at Q. Taking Q as the centre and the same radius cut the arc at S. Join OS. Thus, ∠AOS is the required angle of 120°.