Question

Draw a line segment AB = 5.6 cm . At point A , construct an angle of 120 degree , using compass . Now construct tits supplement at the point B.

Answer 1

supplement of 120°is 60°.
when we take any radius for an arc keeping the compass on A .And when the arc meets the line segment at a point ,keeping the compass at that point , if we cut the arc ,we get 60°,and 60+60=120 .
So,keeping the compass at the point of 60°,we should cut the arc again ,we get 120°...