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JEE Mains · Maths · STD 11 - 9. straight line

माना \(\mathrm{A}(\mathrm{a}, \mathrm{b}), \mathrm{B}(3,4)\) तथा \((-6,-8)\) एक त्रिभुज के केन्द्रक परिकेन्द्रक तथा लंबकेन्द्र है। तो बिंदु \(P(2 a+3,7 b+5)\) की रेखा \(2 x+3 y-4=0\) से, रेखा \(\mathrm{x}-2 \mathrm{y}-1=0\) समांतर नापी गई दूरी ........... है।

  1. A  \(\frac{15 \sqrt{5}}{7}\)
  2. B \(\frac{17 \sqrt{5}}{6}\)
  3. C \(\frac{17 \sqrt{5}}{7}\)
  4. D \(\frac{\sqrt{5}}{17}\)
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Correct Answer

(C) \(\frac{17 \sqrt{5}}{7}\)

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Detailed explanation

\(\mathrm{A}(\mathrm{a}, \mathrm{b}), \quad \mathrm{B}(3,4), \quad \mathrm{C}(-6,-8)\) \(\Rightarrow \mathrm{a}=0, \mathrm{~b}=0 \quad \Rightarrow \mathrm{P}(3,5)\) Distance from \(P\) measured along \(x-2 y-1=0\) \(\Rightarrow x=3+r \cos \theta, \quad y=5+r \sin \theta\) Where…
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