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математика
тетраэдральная область
общая лексика
группа тетраэдра
['ri:dʒ(ə)n]
общая лексика
область
регион
зона
район
отдел тела
область тела
полоса
сфера
участок
строительное дело
территория
существительное
общая лексика
область
район
зона
край
страна
пространство
сфера
округ
район (страны, города)
слой (атмосферы и т. п.)
место
места (также перен.)
анатомия
часть тела
In a tetrahedral molecular geometry, a central atom is located at the center with four substituents that are located at the corners of a tetrahedron. The bond angles are cos−1(−1⁄3) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH4) as well as its heavier analogues. Methane and other perfectly symmetrical tetrahedral molecules belong to point group Td, but most tetrahedral molecules have lower symmetry. Tetrahedral molecules can be chiral.