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

माना रेखा \(y=x+1\) में, वृत्त \(c_1: x^2+y^2-2 x-6 y+\) \(\alpha=0\) का दर्पण प्रतिबंब \(c_2: 5 x^2+5 y^2+10 gx +\) \(10 fy +38=0\) है। यदि वृत्त \(c _2\) की त्रिज्या \(r\) है, तो \(\alpha+6 r^2\) बराबर है \(...........।\)

  1. A \(13\)
  2. B \(11\)
  3. C \(12\)
  4. D \(10\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(12\)

Step-by-step Solution

Detailed explanation

Image of centre \(c _{1} \equiv(1,3)\) in \(x - y +1=0\) is given by \(\frac{x_{1}-1}{1}=\frac{y_{1}-3}{-1}=\frac{-2(1-3+1)}{1^{2}+1^{2}}\) \(x_{1}=2, y_{1}=2\) \(\therefore\) Centre of circle \(c _{2} \equiv(2,2)\) \(\therefore\) Equation of \(c_{2}\) be…
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app