a variable point on a rectangle@@
@There is a variable point on a rectangle.Point P moves on rectangle ABCD( B->C ).

Point of intersection(two gray lines) means area of triangle ABP.

Move point P to find the quality between the area of triangle ABP and the length of locus(P).
@You can also move point P ,the numbers and top segment length (the length of unit)on CABRI.

Download CABRI‡U data (d59) from here.