| 11. | Since all parabolas are similar, this simple case represents all others.
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| 12. | The required point is where this line intersects the parabola.
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| 13. | The simplest example in modern language is the area of the parabola.
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| 14. | But that is a routine consequence of the equation of the parabola.
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| 15. | Not every inverse curve of a parabola is a cardioid.
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| 16. | If it has been shifted up, the parabola must open down.
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| 17. | The line of the centres of a parabolic hexlet is a parabola.
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| 18. | He also demonstrated that a catenary was not a parabola.
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| 19. | Suppose I have two or three points of data regarding a parabola.
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| 20. | Sliced vertically, it would be a parabola, or an open universe.
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