The point of intersection of y-axis and the perpendicular bisector of line segment joining A (3, 6) and B (-3, 4) is :
A
(0, 3)
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B
(0, 8)
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C
(0, 5)
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D
(0, 2)
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Solution
The correct option is B (0, 5) Let y axis meets the perpendicular bisector of AB at the point P(0,y) PA=PB PA2=PB2 (30)2+(6y)2=(30)2+(4y)2 9+36+y212y=9+16+y28y 36−12y=16−8y 4y=20 =>y=5 Therefore the required point is P(0, 5).