A19. The "Bisector" tool (1)
Draw the bisector "b" from the "α" angle
The bisector is the line that divides the angle into two equal parts.
1st. Activate the "Bisector" tool 
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2nd. Click on three points in order to define the rays and do not forget that the second click must be on the vertex.
3rd Name the bisector "b".Two intersecting lines define 4 angles, therefore they have two bisectors. If you click on the rays, the "Bisector" tool interprets them as lines and shows two bisectors.
The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.
If the activity is correct, you will get 10 points automatically.
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2nd. Click on three points in order to define the rays and do not forget that the second click must be on the vertex.
3rd Name the bisector "b".Two intersecting lines define 4 angles, therefore they have two bisectors. If you click on the rays, the "Bisector" tool interprets them as lines and shows two bisectors.
The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.
If the activity is correct, you will get 10 points automatically.