Points H, B, C, D, and F are all on plane , so they are coplanar.

Example 2

Which of the marked points are not on plane ?

Points A, E, and G aren't on plane .

Example 3

What is the intersection of planes and ?

The planes intersect along line BD.

Example 4

What word best describes the relationship between lines BD and EG?

Since the two lines do not lie in a single plane, they are skew lines. Another way of seeing that they are skew is that they are neither parallel nor intersecting.