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GUJCET · Maths · Vector Algebra

શિરોબિંદુ A(1, 1, 2), B(2, 3, 5) અને C(1, 5, 5) વાળા ત્રિકોણનું ક્ષેત્રફળ _________.

  1. A \(\sqrt{61}\)
  2. B \(\sqrt{43}\)
  3. C \(\frac{\sqrt{43}}{2}\)
  4. D \(\frac{\sqrt{61}}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\frac{\sqrt{61}}{2}\)

Step-by-step Solution

Detailed explanation

\( \vec{AB} = (2-1)\hat{i} + (3-1)\hat{j} + (5-2)\hat{k} = \hat{i} + 2\hat{j} + 3\hat{k} \) \( \vec{AC} = (1-1)\hat{i} + (5-1)\hat{j} + (5-2)\hat{k} = 0\hat{i} + 4\hat{j} + 3\hat{k} \)
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