If two circles \(x^2 + y^2 +2gx + 2fy = 0\) and \(x^2 + y^2 +2g's + – McqOptions

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1.	If two circles \(x^2 + y^2 +2gx + 2fy = 0\) and \(x^2 + y^2 +2g's + 2f'y = 0\) touch each other then which of the following is true?
A.	gf = g’f’
B.	g’f = gf’
C.	gg’ = ff’
D.	None of these
Answer» C. gg’ = ff’

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