If the triangle ABC whose vertices are `A(-1, 1, 1), B(1, -1, 1) and C(1, 1, -1)` is projected on xy-plane, then the area of the projection triangles is…..

If the triangle ABC whose vertices are A(-1,1,1), B(1,-1,1) and C(1,1,-1) is projected on XY plane and the area of the projected triangle is m then find (m(m+1))/(2)

The area of the triangle whose vertices are A (1,-1,2), B (2, 1, -1) and C ( 3, -1, 2) is

Find the area of the triangle whose vertices are A(1, 2, 3), B(2, –1, 1)and C(1, 2, –4).

The area of triangle whose vertices are (1,2,3), (2,5,-1) and (-1,1,2) is

Find the area of the triangle whose vertices are : A(1,2,3), B(2,-1,4) and C(4,5,-1)

Find the area of the triangle whose vertices are A(1,2,3) , B(2,3,1) and C(3,1,2)

the area of triangle whose vertices are (1,2,3),(2,5-1) and (-1,1,2) is

The area of the triangle whose vertices are A = (1,-1,2), B= (2,1,-1) and C = (3,-1,2) is