Just make a line segment AB ( any measure ) then put the compass at A and make an arc ( not towards B but other side which is not on line ) then without disturbing the compass from A cut point on the arc ( 60°) now put compass on the 60° and cut one more with same radius of compass at the arc (60+60=120°) now just extend a line from A to the 2nd cut part as long as you want..then join B and the end of the extended part.
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thank u very much
np :D to bisect it make an arc from point A to the 120° line or we can say AC and then from the two endpoints of the arc with same radius of compass cut an arc in front of the angle..their intersection would be 60° or you may have already seen it..