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

बिंदुओं \((5,-1,4)\) तथा \((4,-1,3)\) को मिलाने वाले रेखाखण्ड का समतल \(x+y+z=7\) पर डाले गए प्रक्षेप की लम्बाई है

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

Answer & Solution

Correct Answer

(C) \(\sqrt {\frac{2}{3}} \)

Step-by-step Solution

Detailed explanation

\(A C=\overrightarrow{A B} \cdot \hat{A C}=(\hat{i}+\hat{k}) \cdot \frac{(\hat{i}+\hat{j}+\hat{k})}{\sqrt{3}}=\frac{2}{\sqrt{3}}\) Now, \(A^{\prime} B^{\prime}=B C=\sqrt{A B^{2}-A C^{2}}=\sqrt{2-\frac{4}{3}}=\sqrt{\frac{2}{3}}\) Length of projection \(=\sqrt{\frac{2}{3}}\)
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