CONIC SECTIONS
\kənˈɪk sˈɛkʃənz], \kənˈɪk sˈɛkʃənz], \k_ə_n_ˈɪ_k s_ˈɛ_k_ʃ_ə_n_z]\
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The curves formed by the intersection of a cone with a plane. They are of three kinds-Ellipses, Hyperbolas, and Parabolas, according to the direction of the cutting plane. A point traces out a conic section when it moves in such a manner that its distance from a fixed point bears a constant ratio to its perpendicular distance from a fixed line. The fixed point is called the focus, the fixed line the directrix of the conic section.
By Henry Percy Smith
Word of the day
basidiomycota
- comprises fungi bearing the spores on basidium: Gasteromycetes (puffballs); Tiliomycetes (comprising orders Ustilaginales (smuts) and Uredinales (rusts)); Hymenomycetes (mushrooms; toadstools; agarics; bracket fungi); in some classification systems considered a division of kingdom comprises fungi bearing spores on a basidium; includes Gasteromycetes (puffballs) Tiliomycetes comprising the orders Ustilaginales (smuts) and Uredinales (rusts) Hymenomycetes (mushrooms, toadstools, agarics bracket fungi).