There are 5 points in the figure (<em>V</em>, <em>W</em>, <em>X</em>, <em>Y</em>, and <em>Z</em>)
<em>a</em> refers to the line through <em>V</em>, <em>W</em>, and <em>X</em>.
<em>b</em> refers to the line through points <em>Y</em>, <em>W</em>, and <em>Z</em>.
<em>D</em> refers to the plane that contains all 5 points as well as the 2 lines.
