# Parabola (Locus Construction)

- Author:
- Tim Brzezinski

- Topic:
- Constructions, Parabola

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 ( ).