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

यदि \(a >0\) के लिए, बिंदुओं \(A ( a ,-2 a , 3)\) तथा \(B (0,4,5)\) से समतल \(l x + my + nz =0\) पर लम्बों के पाद क्रमशः बिंदु \(C (0,- a ,-1)\) तथा \(D\) हैं, तो रेखा खंड \(CD\) की लम्बाई है 

  1. A \(\sqrt{31}\)
  2. B \(\sqrt{41}\)
  3. C \(\sqrt{55}\)
  4. D \(\sqrt{66}\)
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Correct Answer

(D) \(\sqrt{66}\)

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C lies on plane \(\Rightarrow-m a-n=0 \Rightarrow \frac{m}{n}=-\frac{1}{a} \ldots .(1)\) \(\overline{ CA } \| l \hat{ i }+ m \hat{ j }+ n \hat{ k }\) \(\frac{a-0}{l}=\frac{-a}{m}=\frac{4}{n} \Rightarrow \frac{m}{n}=-\frac{a}{4}\) \(....(2)\) From \((1) \& (2)\)…
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