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JEE Mains · Maths · STD 12 - 11. three dimension geometry

माना एक त्रिभुज \(\mathrm{PQR}\) में \(\mathrm{R}(-1,4,2)\) है। माना \(\mathrm{PQ}\) का मध्य बिंदु \(\mathrm{M}(2,1,2)\) है। तो रेखाओं \(\frac{x-2}{0}=\frac{y}{2}=\frac{z+3}{-1}\) तथा \(\frac{x-1}{1}=\frac{y+3}{-3}=\frac{z+1}{1}\) के प्रतिच्छेदन बिंदु से \(\triangle \mathrm{PQR}\) के केन्द्रक की दूरी ........... है।

  1. A \(69\)
  2. B \(9\)
  3. C \(\sqrt{69}\)
  4. D  \(\sqrt{99}\)
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Answer & Solution

Correct Answer

(C) \(\sqrt{69}\)

Step-by-step Solution

Detailed explanation

Centroid \(G\) divides \(M R\) in \(1: 2\) \(\mathrm{G}(1,2,2)\) Point of intersection \(A\) of given lines is \((2,-6,0)\) \(\mathrm{AG}=\sqrt{69}\)
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