What is the area of the triangle with vertices `( 1, 2, 3), (2, 5, -1)` and `(-1, 1, 2)`?

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Q 2369456315.     What is the area of the triangle with vertices

`( 1, 2, 3), (2, 5, -1)` and `(-1, 1, 2)`?
NDA 2011 Paper 1
A

`(sqrt (155))/2` sq units

B

`(sqrt (175) )/2` sq units

C

`(sqrt (155) )/4` sq units

D

`(sqrt (175) )/4` sq units

HINT


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

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