Show that the diagonals of the parallelogram whose sides are lx+my+n=0 – InterviewSolution

1.	Show that the diagonals of the parallelogram whose sides are lx+my+n=0, lx+my+n′=0, mx+ly+n=0 and mx+lu+n′=0 include an angle π2
Answer» Show that the diagonals of the parallelogram whose sides are $l x + m y + n = 0$ , $l x + m y + n^{^{'}} = 0$ , $m x + l y + n = 0$ and $m x + l u + n^{^{'}} = 0$ include an angle $\frac{π}{2}$

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