The equation of pair of lines 6x2+13xy+6y2=0 are, 3x+2y=0 And, 2x+3y=0 The quad equation quad of quad pair lines 6x2+13xy+6y2+10x+10y+4=0 are, 3x+2y+2=0 And, 2x+3y+2=0 Consider the figure shown below.
AB is parallel to CD and BC is parallel to AD. So, ABCD is a parallelogram. Also, AB=BC=CD=AD=