the regular triangle and the right triangle on the circle VOL.2
@There is a right triangle on the circle. There is a regular triangle on side AB. There is a regular triangle on side BC like this. There are two parallel lines(AB//PD).
And there are the other two parallel lines(BC//PE).


What a geometric quality do Point P have ?

Move point A to find the geometric quality.

Download CABRIU data (d119) from here.