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

माना बिंदु \(\mathrm{P}(3,-2,-9)\) का बिंदुओं \((-1,-2,-3)\), \((9,3,4),(9,-2,1)\) से होकर जाने वाले समतल पर लंब का पाद \(\mathrm{Q}(\alpha, \beta, \gamma)\) है, तो मूलबिंदु से \(\mathrm{Q}\) की दूरी है :

  1. A \(\sqrt{29}\)
  2. B \(\sqrt{35}\)
  3. C \(\sqrt{42}\)
  4. D \(\sqrt{38}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\sqrt{42}\)

Step-by-step Solution

Detailed explanation

\(P (3,-2,-9)\) Equation of plane through \(A,B,C.\) \(\left|\begin{array}{ccc}x+1 & y+2 & z+3 \\10 & 5 & 7 \\10 & 0 & 4\end{array}\right|=0\) \(2 x+3 y-5 z-7=0\) Foot of \(I ^{ r }\) of \(P (3,-2,-9)\) is \(\frac{x-3}{2}=\frac{y+2}{3}=\frac{z+9}{-5}=-\frac{(6-6+45-7)}{4+9+25}\)…
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