Definition Of A Parabola
How is a parabola defined in terms of its focus and directrix?
AA parabola is a circle in which the center is called the focus and a line segment from the center to the circle is called the directrix.
BA parabola is a square in which the center is called the focus and the length of one side is called the directrix.
CA parabola is the set of all points that have a greater y-value than a fixed point, called the focus, and a lesser x-value than another fixed point, called the directrix.
DA parabola is the set of all points that are equidistant from a fixed point, called the focus, and a fixed line, called the directrix.