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JEE Mains · Maths · STD 11 - 10.2 parabola,ellipse,hyperbola

रेखा \(y = x +1\), दीर्घवृत \(\frac{ x ^2}{4}+\frac{ y ^2}{2}=1\) को दो बिन्दुओं \(P\) तथा \(Q\) पर मिलती है। यदि \(PQ\) व्यास वाले वृत की त्रिज्या \(r\) हो तो \((3 r )^2\) बराबर होगा-

  1. A \(20\)
  2. B \(12\)
  3. C \(11\)
  4. D \(8\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(20\)

Step-by-step Solution

Detailed explanation

Ellipse \(x^{2}+2 y^{2}=4\) Line \(y=x+1\) Point of intersection \(x^{2}+2(x+1)^{2}=4\) \(3 x^{2}+4 x-2=0\) \(\left|x_{1}-x_{2}\right|=\frac{\sqrt{40}}{3}\) \(AB =2 r =\left| x _{1}- x _{2}\right| \sqrt{1+ m ^{2}}\) \(m\) is slope of given line…
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