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

एक वृत्त \(C\), बिन्दु \((4,0)\) से होकर जाता है तथा वृत्त \(x ^{2}+ y ^{2}+4 x -6 y =12\) को बिन्दु \((1,-1)\) पर बाह्य स्पर्श करता है, तो \(C\) की त्रिज्या है

  1. A \(2\sqrt 5 \)
  2. B \(4\)
  3. C \(5\)
  4. D \(\sqrt {57} \)
Verified Solution

Answer & Solution

Correct Answer

(C) \(5\)

Step-by-step Solution

Detailed explanation

Tangent at \(\left( {1, - 1} \right)\) is \(x\left( 1 \right) + y\left( { - 1} \right) + 2\left( {x + 1} \right) - 3\left( {y - 1} \right) - 12 = 0\) \( = 3x - 4y = 7\) required circle is…
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