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

જો \(Q(0, -1, -3)\) એ બિંદુ \(P\) નું સમતલ \(3x -y+4z = 2\) ની સાપેક્ષે પ્રતિબિંબ હોય અને \(R\) એ \((3, -1, -2)\) હોય તો \(\Delta PQR\) નું ક્ષેત્રફળ મેળવો.

  1. A \(\frac{{\sqrt {91} }}{2}\)
  2. B \(2\sqrt {13} \)
  3. C \(\frac{{\sqrt {65} }}{2}\)
  4. D \(\frac{{\sqrt {91} }}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{{\sqrt {91} }}{2}\)

Step-by-step Solution

Detailed explanation

\(\mathrm{MQ}=\frac{|1-12-2|}{\sqrt{9+1+16}}=\frac{13}{\sqrt{26}}=\sqrt{\frac{13}{2}}\) \(P M=\sqrt{26}\) \(\mathrm{RQ}=\sqrt{9+1}=\sqrt{10}\) \(\mathrm{RM}=\sqrt{10-\frac{13}{2}}=\sqrt{\frac{7}{2}}\)…
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