If the quadrilateral formed by the lines...

If the quadrilateral formed by the lines `ax+by+c=0, 6sqrt(3)x+8sqrt(3)y+k=0`, `ax+by+k=0 and 6sqrt(3)x + 8sqrt(3)y+c=0` has diagonals at right angles, then the value of `a^2 +b^2 = …`

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