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

वृत्तों \(x^{2}+y^{2}-4 x-6 y-12=0\) तथा \(x^{2}+y^{2}+6 x+18 y+26=0\) की उभयनिष्ठ स्पर्श रेखाओं की संख्या है

  1. A \(4\)
  2. B \(1\)
  3. C \(2\)
  4. D \(3\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(3\)

Step-by-step Solution

Detailed explanation

\(c_{1}(2,3);\) \(r_{1}=\sqrt{4+9+12}=5\) And \(c_{2}(-3,-9)\) \(r_{2}=\sqrt{9+81-26}=8\) \(\therefore \quad\) Distance \(c_{1} c_{2}=\sqrt{25+144}=13\) \(\therefore \quad c_{1} c_{2}=r_{1}+r_{2}\) touching externally. \(\Rightarrow \quad 3\) common tangents.
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