Answer :

Given and are two adjacent sides of a triangle.



Recall the area of the triangle whose adjacent sides are given by the two vectors and is where



Here, we have (a1, a2, a3) = (1, 2, 3) and (b1, b2, b3) = (–3, –2, 1)






Recall the magnitude of the vector is



Now, we find.






Thus, area of the triangle is square units.


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