The area of a triangle whose vertices are \[A\,(1,\,-1,\,2),\] \[B\,(2,\,1,\,-1)\] and \[C\,(3,\,-1,\,2)\] is [MNR 1983; IIT 1983]

The area of a triangle whose vertices are \[A\,(1,\,-1,\,2),\] \[B\,(2

1.	The area of a triangle whose vertices are \[A\,(1,\,-1,\,2),\] \[B\,(2,\,1,\,-1)\] and \[C\,(3,\,-1,\,2)\] is [MNR 1983; IIT 1983]
A.	13
B.	\[\sqrt{13}\]
C.	6
D.	\[\sqrt{6}\]
Answer» C. 6

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The area of a triangle whose vertices are \[A\,(1,\,-1,\,2),\] \[B\,(2,\,1,\,-1)\] and \[C\,(3,\,-1,\,2)\] is [MNR 1983; IIT 1983]

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