| 21. | Like the Golden Arches, outlaw movies are parabolas.
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| 22. | If we draw it, we get a parabola.
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| 23. | The right-hand side of the diagram shows part of this parabola.
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| 24. | The point E is an arbitrary point on the parabola, with coordinates.
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| 25. | If the discriminant equals 0, the equation is that of a parabola.
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| 26. | This point is specified by the slope of the axis of the parabola.
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| 27. | Draw the parabola by moving the pen so that the string remains taut.
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| 28. | :: Maybe our articles on parabola and catenary can be of help.
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| 29. | Its vault has the shape of a tall parabola.
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| 30. | Surprising that neither parabola nor conic section gives this.
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