1.

If the equation (a_(1)-a_(2))x+(b_(1)-b_(2))y=c represents the perpendicular bisector of the segment joining (a_(1),b_(1)),(a_(2),b_(2)) then 2c=

Answer»

`a_(1)^(2)+b_(1)^(2)-a_(2)^(2)-b_(2)^(2)`
`a_(1)^(2)+b_(1)^(2)+a_(2)^(2)+b_(2)^(2)`
`a_(1)^(2)-b_(1)^(2)+a_(2)^(2)-b_(2)^(2)`
`a_(1)a^(2)+b_(1)B^(2)`

ANSWER :A


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