Double-click on the movie to PLAY.

Click once to PAUSE.

RELOAD the page or double-click to return to the START of the movie.

Method A2

Here we increase the size of the circle through C.
As can be seen, the situation is not defined for at least one size and position of the circle.

The effect is again quite dramatic, with a strange flip happening towards the end of the movie.
Notice that there is one position of Q where we can be sure that QF = QP.

On the next page we keep the size of the circles fixed, but move point P towards F.