Question

LINES BE AND AC ARE

Answer 1

Coplanar means they lie in the same plane, BAEF is a plane on the side of that rectangular prism, that's a hint.

Collinear means they lie on the same line. These are two DIFFERENT line segments.

skew means they are neither parallel nor at right angles to one another and they intersect eachotehr.

Answer 2

Now that you know what these all mean, you can find your answer :)`

Answer 3

@big1174 Skew lines do not intersect. Also, there is not a plane that contains all points of two skew lines.

Think of yourself sitting inside the diagram of the rectangle solid you posted.
Look at the wall containing BE and the ceiling containing AC.

Question: Do you see a point where they intersect?