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

माना रेखा \(\mathrm{L}\) बिन्दु \(\mathrm{P}(2,3,1)\) से होकर जाती है तथा रेखा \(\mathrm{x}+3 \mathrm{y}-2 \mathrm{z}-2=0=\mathrm{x}-\mathrm{y}+2 \mathrm{z}\) के समान्तर है। यदि बिन्दु \((5,3,8)\) की रेखा \(\mathrm{L}\) से दूरी \(\alpha\) है तो \(3 \alpha^2\) बराबर है____________. 

  1. A \(157\)
  2. B \(158\)
  3. C \(159\)
  4. D \(156\)
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Answer & Solution

Correct Answer

(B) \(158\)

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Detailed explanation

\(\left|\begin{array}{ccc}\hat{ i } & \hat{ j } & \hat{ k } \\ 1 & 3 & -2 \\ 1 & -1 & 2\end{array}\right|=4 \hat{ i }-4 \hat{ j }-4 \hat{ k }\) \(\therefore\) Equation of line is \(\frac{ x -2}{1}=\frac{ y -3}{-1}=\frac{ z -1}{-1}\) Let \(Q\) be \((5,3,8)\) and foot of \(\perp\)…
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