Make a 60 degree angle and with the same radius make another semicerclefrom the 60 degree point to make it intersect with the line from where you want to draw the 120 angle (starting point) . The point gained when connected to the starting point will give 120 deree....
draw a horizontal line and draw an adjacent line
with an angle 60°. taking that as midpoint on protractor
draw another line adjacent with an angle 60°.now
an angle of 120° will be formed.the line which is in the middle
is the bisector.
hope this helps you.............mark as brainliest.