The equation of the common chord of the circles \[{{(x-a)}^{2}}+{{(y-b)}^{2}}={{c}^{2}}\]and \[{{(x-b)}^{2}}+{{(y-a)}^{2}}={{c}^{2}}\] is

The equation of the common chord of the circles \[{{(x-a)}^{2}}+{{(y-b

1.	The equation of the common chord of the circles \[{{(x-a)}^{2}}+{{(y-b)}^{2}}={{c}^{2}}\]and \[{{(x-b)}^{2}}+{{(y-a)}^{2}}={{c}^{2}}\] is
A.	\[x-y=0\]
B.	\[x+y=0\]
C.	\[x+y={{a}^{2}}+{{b}^{2}}\]
D.	\[x-y={{a}^{2}}-{{b}^{2}}\]
Answer» B. \[x+y=0\]

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The equation of the common chord of the circles \[{{(x-a)}^{2}}+{{(y-b)}^{2}}={{c}^{2}}\]and \[{{(x-b)}^{2}}+{{(y-a)}^{2}}={{c}^{2}}\] is

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