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GUJCET · Maths · Vector Algebra

\(\mathbf{A}(1,1,1), \mathbf{B}(1,2,3)\) અને \(\mathbf{C}(2,3,1)\) શિરોબિંદુવાળા ત્રિકોણનું ક્ષેત્રફળ _________ચો. એકમ છે.

  1. A \(\frac{19}{2}\)
  2. B \(\frac{\sqrt{21}}{2}\)
  3. C \(\frac{21}{2}\)
  4. D \(\frac{\sqrt{19}}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{\sqrt{21}}{2}\)

Step-by-step Solution

Detailed explanation

\(\vec{AB} = \mathbf{B} - \mathbf{A} = (1-1, 2-1, 3-1) = (0,1,2)\) \(\vec{AC} = \mathbf{C} - \mathbf{A} = (2-1, 3-1, 1-1) = (1,2,0)\)
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