If the two circles, x^2+y^2+2g1x+2 f1y=0...

If the two circles, `x^2+y^2+2g_1x+2 f_1y=0` & `x^2+y^2+2g_2x+2f_2y=0` touch each other then (1)`f_1g_1=f_2g_2` (2)`(f_1)/(g_1) = (f_2)/(g_2)` (3) `f_1f_2=g_1g_2` (4) none of these

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If the two circles, `x^2+y^2+2g_1x+2 f_1y=0` & `x^2+y^2+2g_2x+2f_2y=0` touch each other then (1)`f_1g_1=f_2g_2` (2)`(f_1)/(g_1) = (f_2)/(g_2)` (3) `f_1f_2=g_1g_2` (4) none of these

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