Think about the different three-dimensional vocabulary you learned in this lesson.

1. Name two sets of geometric figures that can intersect to form a point.

   Answer (a):

   Two lines
   Three planes

2. Is the face of a cube an example of a point, a plane (flat surface), or skew lines? Explain why it cannot be either of the other two.

   Help (b):

   Point: a singular location in space.
   Plane: a flat surface.
   Skew lines: lines in space that do not interesect and are not parallel.

   Hint (b):

   The face of a cube has surface area.