two lines part2Ā@Ā@
Ā@There are two lines(AC,B'D). These lines meet on Point O.You can move points(A,B) keeping Angle AOB' and the length of segments(AC,BD).
Move points(A,B,O) and change the number of Angle AOB' to find the geometric quality of Quadrilateral ABCD.
Download CABRIáU data (d98) from here.