hello:
  Is there anyone can help me that problem:
    I have two rectangles in the same plane with coodinate x,y(no 3 coodinate concerned),both rects have their posx,y(in reference to original point of coodinate x,y),length, width, and angle(smaller than 360 degree) between the border of length and coodinate X or its parallel line
  like this:
     bool IsTwoRectRedundant(float x1,
                             float y1,
                             float length1,
                             float width1,
                             float angle1,
                             float x2,
                             float y2,
                             float length2,
                             float width2,
                             float angle2)
anybody can help me solve that problem or offer me useful and well notated links