Instructions for constructing
an angle bisector.
The circles represent the arcs.
Create the intersections that you see here.
Start with an arc from the vertex "A" though the two rays (red
circle) to create the intersections at "D" and "E".
Next use center "E" and radius "ED" to construct another arc (pink).
Note the radius of the pink circle is
the distance between the two points "E" and "D", on the rays.
Next use center "D" and radius "DE" to construct another arc (blue).
Note the radius of the blue circle is
the distance between the two points "D" and "E", on the rays.
Notice that this has created another intersection point "F".
Use the vertex "A" and the intersection of the pink
and blue circles "F" to construct the angle
bisector (green).
Yahoo! You have constructed an angle bisector.
Now do the same thing at another angle.
Good luck!
Circumcenter Centriod
Incenter
Orthocenter
all
four points together
Period
3 Period 4
Period 5