Question
दो वृत्त ${x^2} + {y^2} - 4y = 0$ व ${x^2} + {y^2} - 8y = 0$
${C_1}{C_2} = 2$
$\because \;{r_2} - {r_1} = {C_1}{C_2}$
अत: वृत्त अन्त:स्पर्श करते हैं।
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