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

दिक अनुपात \(2,1,2\) की एक रेखा, रेखाओं \(\mathrm{x}=\mathrm{y}+2=\mathrm{z}\) तथा \(\mathrm{x}+2=2 \mathrm{y}=2 \mathrm{z}\) को क्रमशः बिंदुओं \(\mathrm{P}\) तथा \(\mathrm{Q}\) पर मिलती है। यदि बिंदु \((1,2,12)\) से रेखा \(\mathrm{PQ}\) पर लंब की लंबाई \(l\) है, तो \(l^2\) = ...........

  1. A \(63\)
  2. B \(65\)
  3. C \(42\)
  4. D \(56\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(65\)

Step-by-step Solution

Detailed explanation

Let \(\mathrm{P}(\mathrm{t}, \mathrm{t}-2, \mathrm{t})\) and \(\mathrm{Q}(2 \mathrm{~s}-2, \mathrm{~s}, \mathrm{~s})\) \(D.R\)'s of \(PQ\) are \(2, 1,2\) \( \frac{2 s-2-t}{2}=\frac{s-t+2}{1}=\frac{s-t}{2} \) \( \Rightarrow t=6 \text { and } s=2 \)…
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