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

एक समतल, बिंदुओं \(A (1,2,3), B (2,3,1)\) तथा \(C (2,4,2)\) से होकर जाता है यदि \(O\) मूल बिन्दु है तथा \(P\), बिन्दु \((2,-1,1)\) है, तो इस समतल पर \(\overline{ OP }\) के प्रक्षेप की लम्बाई है 

  1. A \(\sqrt{\frac{2}{7}}\)
  2. B \(\sqrt{\frac{2}{3}}\)
  3. C \(\sqrt{\frac{2}{11}}\)
  4. D \(\sqrt{\frac{2}{5}}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\sqrt{\frac{2}{11}}\)

Step-by-step Solution

Detailed explanation

Normal to plane \(\vec{n}=\left|\begin{array}{ccc}\hat{i} & \hat{j} & \hat{k} \\ 1 & 1 & -2 \\ 0 & 1 & 1\end{array}\right|\) \(=3 \hat{i}-\hat{j}+\hat{k}\) \(\overline{O P}=2 \hat{i}-\hat{j}+\hat{k}\)…
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