Radius of the circle \[(x-1)(x-3)+(y-2)(y-4)\] \[=0\] is

1.	Radius of the circle \[(x-1)(x-3)+(y-2)(y-4)\] \[=0\] is
A.	2
B.	\[\sqrt{2}\]
C.	3
D.	\[2\sqrt{2}\]
Answer» C. 3

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Radius of the circle \[(x-1)(x-3)+(y-2)(y-4)\] \[=0\] is

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