The coordinates of points A, B and C are (1, 2, 3), (2, -1, 4) and (4, 5, -1) respectively.
We need to find the area of this triangle ABC.
We have the formula given as,
Let us find out and first.
We can say,
Position vector of A
Position vector of B
Position vector of C
Position vector of B-Position vector of A
Position vector of C-Position vector of A
Now, substitute values of and in . We can find out as,
From equation (i), we get
Thus, area of ∆ABC is .
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