As you observe what happens when you modify the applet below, pay close attention to the relationship between point F, all points P, and line d.

Point F is called the "FOCUS" of this particular locus (set of points).
Line d is called the "DIRECTRIX" of this locus.
Fill in the blanks () to make a true statement. Hint: The terms "FOCUS" and "DIRECTRIX" are answers to at least one blank below.
The locus of points shown in red is a ( ).
Thus, a ( ) is a ( ), or set of ( ).
Each point P on this ( ) is ( ) from a fixed point called the ( ) and a given line called the ( ).