If the two circles, $x^2 + y^2 + 2 g_1x + 2 f_1y = 0\, \& \,x^2 + y^2 + 2 g_2x + 2 f_2y = 0$ touch each then:
If the two circles, $x^2 + y^2 + 2 g_1x + 2 f_1y = 0\, \& \,x^2 + y^2 + 2 g_2x + 2 f_2y = 0$ touch each then:
- A
$f_1 g_1 = f_2 g_2$
- B
$\frac{{{f_1}}}{{{g_1}}} = \frac{{{f_2}}}{{{g_2}}}$
- C
$f_1 f_2 = g_1 g_2$
- D
none
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