Find the area of the triangle in R3\mathbb{R}^3R3 with vertices (0,0,0),(1,1,1)(0,0,0), (1,1,1)(0,0,0),(1,1,1), and (1,2,3)(1,2,3)(1,2,3).
6/2\sqrt{6} / 26/2
6\sqrt{6}6
3
14/2\sqrt{14} / 214/2