Find the condition that the diagonals of...

Find the condition that the diagonals of the parallelogram formed by the lines `ax + by + c = 0 ; ax + by + c' = 0; a'x + b'y + c' = 0`, a`x + b'y + c' = 0` are at right angles. Also find the equation to the diagonals of the parallelogram.

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