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Mathematics 11 Online
OpenStudy (anonymous):

How can I prove that the line joining two centres of two circles which intersect at two points is the perpendicular bisector of their common chord?

OpenStudy (anonymous):

Huh, never thought about it. It's true though. Simple picture is easy enough to see it. I'll have to ponder the proof though.|dw:1417935220661:dw|

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