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JEE Mains · Maths · STD 11 - 10.1 circle and system of circle

माना \(A =\left\{( x , y ) \in R \times R \mid 2 x ^{2}+2 y ^{2}-2 x -2 y =1\right\},\) \(B =\left\{( x , y ) \in R \times R \mid 4 x ^{2}+4 y ^{2}-16 y +7=0\right\}\)  तथा \(C =\left\{( x , y ) \in R \times R \mid x ^{2}+ y ^{2}-4 x -2 y +5 \leq r ^{2}\right\}\) है। तो \(| r |\) का निम्नतम मान, जिसके लिए \(A \cup B \subseteq C\) है, बराबर है

  1. A \(\frac{3+\sqrt{10}}{2}\)
  2. B \(1+\sqrt{5}\)
  3. C \(\frac{2+\sqrt{10}}{2}\)
  4. D \(\frac{3+2 \sqrt{5}}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\frac{3+2 \sqrt{5}}{2}\)

Step-by-step Solution

Detailed explanation

\(\mathrm{S}_{1}: \mathrm{x}^{2}+\mathrm{y}^{2}-\mathrm{x}-\mathrm{y}-\frac{1}{2}=0 ; \mathrm{C}_{1}\left(\frac{1}{2}, \frac{1}{2}\right)\) \(\mathrm{r}_{1}=\sqrt{\frac{1}{4}+\frac{1}{4}+\frac{1}{2}}=1\)…
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