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Q. I. A line through the focus and perpendicular to the directrix is called the axis of the parabola.
II. The point of intersection of parabola with the axis is called the vertex of the parabola.

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Solution:

A line through the focus and perpendicular to the directrix is called the axis of the parabola. The point of intersection of parabola with the axis is called the vertex of the parabola.

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