| 1. | This form is analogous to the equation for a conic section:
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| 2. | The conic sections of the Euclidean plane have many distinguishing properties.
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| 3. | He studied conic sections, cubic equations and problems of artillery.
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| 4. | An ellipse is a conic section that does not intersect this line.
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| 5. | See the section Conic section and quadratic form, above.
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| 6. | In his " Treatise on the Conic Sections"
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| 7. | Several familiar concepts concerning conic sections are directly related to this polarity.
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| 8. | A conic section has one Dandelin sphere for each focus.
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| 9. | The above relation between r and \ theta describes a conic section.
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| 10. | So, can there be sines for other conic sections as well?
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