The lines x−21=y−31=z−4−k and x−1k=y−42=z−51 are coplanar ifk=3 or -2k=0 or -1k=1 or -1k=0 or -3

The angle between the line x−21=y−32=z−4−1  and the plane x + y + z = 4 is

The points (3, −2, −1), (−1, 1, 2), (2, 3, −4) and (4, 5, λ) are coplanar when λ=

The equation of the lines x+y+z−1=0 and 4x+y−2z+2=0 written in the symmetrical form is

If the mirror image of the point P(3,4,9) in the line x−13=y+12=z−21 is (α,β,γ), then 14(α+β+γ) is :

Four points are always coplanar if they:Check all that apply.A.lie on the same line.B.lie on different planes.C.lie on different lines.D.lie in the same plane.