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

બિંદુઓ \(\left( {5, - 1,4} \right)\) અને \(\left( {4, - 1,3} \right)\) ને જોડતા રેખાખંડનો સમતલ \(x + y + z = 7\) પરનો પ્રક્ષેપ . . . ..લંબાઇનો છે.

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