A parabola is the set of all points in the plane that are equidistant from a fixed point called the ______ and a fixed line called the _______ of the parabola.
The blanks and complete the statement.
The vertex of the parabola lies halfway between the focus and the directrix, and the axis of symmetry is the line that runs through the focus perpendicular to the directrix. Thus, all the points on the parabola are equidistant from the focus and the fixed line is called directrix. This can be explained by the figure below.
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