If the area of the triangle whose vertices are `A (1, 2, 3), B (2, -1, 1)` and `C(1, 2, - 4)` is `lambda` sq unit

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Q 2137123082.     If the area of the triangle whose vertices are

`A (1, 2, 3), B (2, -1, 1)` and `C(1, 2, - 4)` is `lambda` sq

unit then `20 sqrt(10) lambda` must be

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(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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