defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Triangles Area

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

1
\(\frac{\sqrt{19}}{2}\)
2
\(\frac{\sqrt{21}}{2}\)
3
\(\frac{19}{2}\)
4
\(\frac{21}{2}\)
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