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

જો \(a >0\) માટે બિંદુઓ \(A ( a ,-2 a , 3)\) અને \(B (0,4,5)\) પર સમતલ \(l x+m y+n z=0\) પર દોરવામાં આવેલ લંબપાદ અનુક્રમે \(C(0,-a,-1)\) અને \(D\) હોય તો રેખાખંડ \(CD\) ની લંબાઈ મેળવો.

  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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