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

રેખાઓ \(\mathrm{L}_1: \mathrm{x}-1=\mathrm{y}-2=\mathrm{z}\) અને \(\mathrm{L}_2: \mathrm{x}-2=\mathrm{y}=\mathrm{z}-1\) ધ્યાનમાં લો. બિંદુ \(\mathrm{P}(5,1,-3)\) થી રેખાઓ \(\mathrm{L}_1\) અને \(\mathrm{L}_2\) પરના લંબપાદ અનુક્રમે \(Q\) અને \(R\) છે. જો ત્રિકોણ PQR નું ક્ષેત્રફળ A હોય, તો \(4 \mathrm{~A}^2\) = ___

  1. A 139
  2. B 147
  3. C 151
  4. D 143
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Answer & Solution

Correct Answer

(B) 147

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Detailed explanation

\begin{aligned} & \mathrm{L}_1: \frac{\mathrm{x}-1}{1}=\frac{\mathrm{y}-2}{1}=\frac{\mathrm{z}-0}{2} \\ & \text { Let } \mathrm{Q}(\lambda+1, \lambda+2, \lambda) \\ & \overrightarrow{\mathrm{PQ}}=(\lambda-4, \lambda-1, \lambda+3) \\ & \overrightarrow{\mathrm{PQ}} \cdot…

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