As you observe what happens when you modify the applet below, pay close attention to the relationship between [color=#1551b5]point F[/color], [color=#c51414]all points P[/color], and [color=#1551b5]line d[/color].

Point F is called the "FOCUS" of this particular locus (set of points). [br]Line d is called the "DIRECTRIX" of this locus. [br][br]Fill in the blanks () to make a true statement. [i]Hint: The terms "FOCUS" and "DIRECTRIX" are answers to at least one blank below.[/i][br][br]The [color=#c51414]locus of points shown in red [/color] is a ( ). [br]Thus, a ( ) is a ( ), or set of ( ). [br][color=#c51414]Each point P on this ( ) [/color][color=#d69210]is ( ) [/color]from a fixed point called the ( ) and a given line called the ( ).