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If the quadrilateral formed by the lines...

If the quadrilateral formed by the lines ax + by +c=0, a'x+b'y+c=0, ax + by + c' = 0, a'x + b'y + c' = 0 has perpendicular diagonals, then

A

`b^2+c^2=b'^2+c'^2`

B

`c^2+a^2=c'^2+a'^2`

C

`a^2+b^2=a'^2+b'^2`

D

none of these

Text Solution

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The correct Answer is:
C
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