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

જો \(\Delta ABC\) માં શિરોબિંદુ \(B\) અને \(C\) એ રેખા \(\frac{{x + 2}}{3} = \frac{{y - 1}}{0} = \frac{z}{4}\) પર આવેલ છે કે જેથી \(BC = 5\, units\) અને જો \(A\, (1, -1, 2)\) હોય તો \(\Delta ABC\) નું ક્ષેત્રફળ મેળવો.

  1. A \(2\sqrt {34} \)
  2. B \(\sqrt {34} \)
  3. C \(6\)
  4. D \(5\sqrt {17} \)
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Answer & Solution

Correct Answer

(B) \(\sqrt {34} \)

Step-by-step Solution

Detailed explanation

Let any point on given line is \(D(3 \lambda-2,1,4 \lambda)\) Now \(A D \perp B C\) \(\mathrm{D} \mathrm{R}\) of \(BC\) \(\Rightarrow a_{1}=3, b_{1}=0, c_{1}=y\) \(D \cdot R,\) of \(A D\) \(\Rightarrow a_{2}=3 \lambda-3, b_{2}=2, c_{2}=4 \lambda-2\)…
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