[] , [] , [^] , []Incenter / In the case of two lines (3)(GC World : Various Problems ,Five centroids of triangle etc.)
The bisectors of two corners of the triangle are drawn, and intersection is called point D.
Let's move point A on the green circle. (You can use "Shift" key.)
What do you find?

GC/Win


Forum of Geometric Constructor by Y.Iijima