Show that the thre angles of the triangle with vertices (1,-1,1), (2,3,-1)` and (3,0,2) ar
Channel: Doubtnut
Date: 2020-04-05

Show that the thre angles of the triangle with vertices (1,-1,1), (2,3,-1)` and (3,0,2) are, respectively, cos^-1 (2/sqrt(114), cos^-1 4/sqrt(176) and cos^-1 17/sqrt(399))`