Fixed line, called the directrix of the parabola - Fixed Points (F) called the focus of the parabola - axis of the parabola. A straight line drawn through is the focus and is perpendicular to the directrix - vertex (V) is the vertex parameters Bo - La cut with the axis of the parabola.(AB) is part of the line, where the through focus and the end point two on the parabola, and perpendicular to the axis of parabolic - straight through the focal point. And perpendicular to the axis of the directrix, called the parabola.
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