2.
a) Collinear
b) Perpendicular line (It could be called a vector normal to the plane too)
c) Plane M
d) A, E, B
e) perpendicular
3.
a) V, W, X
b) Plane R
c) Perpendicular
d) 5, The plane R and the planes that form the pyramid.
e) The point W contains 3 planes (R, WXZ, WVZ )
4.
a) Perpendicular
b) Parallel
c) D and E are collinear points (they are not coplanar because they are not in the same plane)
d) One time for the line l.