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

ધારો કે બિંદુ \(Q(10,-3,-1)\) થી રેખા \(\frac{x-3}{7}=\frac{y-2}{-1}=\frac{z+1}{-2}\) પરના લંબનો પદ \(P\) છે. તો કાટકોણ ત્રિકોણ \(P Q R\) નું ક્ષેત્રફળ, જ્યાં \(R\) એ બિંદુ \((3,-2,1)\) છે, તે ___ છે.

  1. A \(9 \sqrt{15}\)
  2. B \(\sqrt{30}\)
  3. C \(8 \sqrt{15}\)
  4. D \(3 \sqrt{30}\)
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Correct Answer

(D) \(3 \sqrt{30}\)

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Detailed explanation

\(\begin{aligned} & \frac{\mathrm{x}-3}{7}=\frac{\mathrm{y}-2}{-1}=\frac{\mathrm{z}+1}{-2}=\lambda \\ & \Rightarrow 7 \lambda+3,-\lambda+2,-2 \lambda-1 \\ & \text {dr's of QP } \Rightarrow 7 \lambda-7,-\lambda+5,-2 \lambda \end{aligned}\) Now…
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