If the vertices of a triangle are `A(1,4,2), B(-2,1,2),C(2,3,-4)` then find `/_A,/_B,/_C`.

If the vertices of a triangle are (1,4,2),(-2,1,2),(2,3,-4) then the angles are

If the vertices of a triangle A, B, C are A(0, 0), B(2, 1), C(9, -2) then cosB =

The vertices of a Delta^(l e) are A=(-2,8), B=(1,2), C=(7,-1). Find the equation of median through A.

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 (2lambda)/(sqrt(10)) must be

Find the area of a rhombus ABCD, whose vertices taken in order, are A (-1, 1), B(1, -2), C(3, 1) and D(1, 4).

If the centroid of the triangle formed by (a,1,3) ,(-2,b,-5) and (4,7,c) is the origin then (a,b,c) =