AP EAMCET Engineering 26 Apr 2017 Shift 1 Paper

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=

2

√13

Therefore, ABCD is a rhombus.