Find the area of a triangle having the points`A(1, 1, 1)`, `B(1, 2, 3)`and `C(2, 3, 1)`as its vertices.

Explanation

To find the area of the triangle formed by the points \( A(1, 1, 1) \), \( B(1, 2, 3) \), and \( C(2, 3, 1) \), we can follow these steps:

### Step 1: Find the vectors \( \vec{AB} \) and \( \vec{AC} \)

The vector \( \vec{AB} \) is calculated as follows:
\[ \vec{AB} = B - A = (1, 2, 3) - (1, 1, 1) = (1-1, 2-1, 3-1) = (0, 1, 2) \]
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