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JEE Mains · Maths · STD 12 - 10. vector algebra

ધારો કે  \(\mathrm{A}(2,3,5)\) અને \(\mathrm{C}(-3,4,-2)\) એ સમાંતરબાજુ ચતુષ્કોણ \(\mathrm{ABCD}\) ના સામસામેના શિરોબિંદુુઓ છે. જો વિકર્ણ \(\overrightarrow{\mathrm{BD}}=\hat{i}+2 \hat{j}+3 \hat{k}\) હોય, તો સમાંતરબાજુ ચતુષ્કોણનું ક્ષેત્રફળ ........... છે.

  1. A \(\frac{1}{2} \sqrt{410}\)
  2. B \(\frac{1}{2} \sqrt{474}\)
  3. C  \(\frac{1}{2} \sqrt{586}\)
  4. D  \(\frac{1}{2} \sqrt{306}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{1}{2} \sqrt{474}\)

Step-by-step Solution

Detailed explanation

Area \(=|\overrightarrow{\mathrm{AC}} \times \overrightarrow{\mathrm{BD}}|\) \(=\left|\begin{array}{ccc}\hat{i} & \hat{j} & \hat{k} \\ 5 & -1 & 7 \\ 1 & 2 & 3\end{array}\right|\) \(=\frac{1}{2}|-17 \hat{\mathrm{i}}-8 \hat{\mathrm{j}}+11 \hat{\mathrm{k}}|=\frac{1}{2} \sqrt{474}\)
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