text: And this is called as directrix. ಇದನ್ನ ಏನಂತ ಕರೀತೀವಿ ಮಕ್ಕಳೇ? Directrix ಅಂತ ಕರೀತೀವಿ. Okay, this is called as directrix. Okay, so set of all points in a plane which are equidistant from a fixed point and a fixed line is called as, is called as parabola.