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

दीर्घवृत्त \(\frac{x^2}{4}+\frac{y^2}{2}=1\) की जीवा की लंबाई, जिसका मध्य-बिंदु \(\left(1, \frac{1}{2}\right)\) है, वह कितनी है?

  1. A \(\frac{5}{3} \sqrt{15}\)
  2. B \(\frac{1}{3} \sqrt{15}\)
  3. C \(\frac{2}{3} \sqrt{15}\)
  4. D \(\sqrt{15}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{2}{3} \sqrt{15}\)

Step-by-step Solution

Detailed explanation

\begin{aligned} & T=S_1 \\ & \frac{x \cdot 1}{4}+\frac{y}{4}=\frac{1}{4}+\frac{1}{8} \\ & \Rightarrow 2 x+2 y=3 \\ & \frac{x^2}{4}+\frac{\left(\frac{3-2 x}{2}\right)^2}{2}=1 \\ & \Rightarrow x=\frac{12 \pm \sqrt{120}}{12} \Rightarrow y=\frac{1}{2} \mp \frac{\sqrt{120}}{12}…

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