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

જો \(A(3,1,-1), B\left(\frac{5}{3}, \frac{7}{3}, \frac{1}{3}\right), C(2,2,1)\) અને \(D\left(\frac{10}{3}, \frac{2}{3}, \frac{-1}{3}\right)\) એ ચતુષ્કોણ \(A B C D\) ના શિરોબિંદુઓ હોય , તો તેનું ક્ષેત્રફળ (ચો . એકમમાં) ........... છે.

  1. A  \(\frac{4 \sqrt{2}}{3}\)
  2. B \(\frac{5 \sqrt{2}}{3}\)
  3. C  \(2 \sqrt{2}\)
  4. D  \(\frac{2 \sqrt{2}}{3}\)
Verified Solution

Answer & Solution

Correct Answer

(A)  \(\frac{4 \sqrt{2}}{3}\)

Step-by-step Solution

Detailed explanation

Area \(=\frac{1}{2}|\overline{\mathrm{BD}} \times \overline{\mathrm{AC}}|\) \( \overline{\mathrm{BD}}=\frac{5}{3} \hat{\mathrm{i}}-\frac{5}{3} \hat{\mathrm{j}}-\frac{2}{3} \hat{\mathrm{k}} \) \( \overline{\mathrm{AC}}=\hat{\mathrm{i}}-\hat{\mathrm{j}}-2 \hat{\mathrm{k}}\)
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