| 11. | Several familiar concepts concerning conic sections are directly related to this polarity.
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| 12. | This is a special case of the three conics theorem.
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| 13. | All these degenerate conics may occur in pencils of conics.
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| 14. | All these degenerate conics may occur in pencils of conics.
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| 15. | The transponder was a standard Loral / Conic S-Band transponder.
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| 16. | A conic section has one Dandelin sphere for each focus.
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| 17. | Equivalently again, both sheets of the focal surface degenerate to conics.
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| 18. | The above relation between r and \ theta describes a conic section.
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| 19. | The crown is conic, with widely spaced branches with drooping branchlets.
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| 20. | The group of its projectivities is then the group that permutes conics.
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