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- этимология
Что (кто) такое tetrahedral surface - определение
Inverted tetrahedral geometry; Tetrahedral geometry; Tetrahedral complex ion; Tetahedral molecular geometry; Tetrahedral coordination geometry; Examples of tetrahedral structures; Tetrahedral molecule; Tetrahedrally; Tetrahedral complex
![Ga2Cl6}} ("[[gallium trichloride]]").](https://commons.wikimedia.org/wiki/Special:FilePath/Gallium-trichloride-from-xtal-2004-3D-balls.png?width=200 "Ga2Cl6}} (\"[[gallium trichloride]]\").")
![<!-- specify width as minus sign vanishes at most sizes --> Calculating bond angles of a symmetrical tetrahedral molecule using a [[dot product]]](https://commons.wikimedia.org/wiki/Special:FilePath/Tetrahedral angle calculation.svg?width=200 "<!-- specify width as minus sign vanishes at most sizes --> Calculating bond angles of a symmetrical tetrahedral molecule using a [[dot product]]")
Surface finish
SMALL, LOCAL DEVIATIONS OF A SURFACE FROM A PERFECTLY FLAT IDEAL; DEFINED BY THE THREE CHARACTERISTICS OF LAY, SURFACE ROUGHNESS, AND WAVINESS
Surface texture symbol; Surface texture; Surface topography
Surface finish, also known as surface texture or surface topography, is the nature of a surface as defined by the three characteristics of lay, surface roughness, and waviness.. It comprises the small, local deviations of a surface from the perfectly flat ideal (a true plane).
Parametric surface
.png?width=200 "1= ''z'' = (''R'' + ''r'' cos ''v'') cos ''u''}}.")
![Parametric surface forming a [[trefoil knot]], equation details in the attached source code.](https://commons.wikimedia.org/wiki/Special:FilePath/Parametric surface illustration (trefoil knot).png?width=200 "Parametric surface forming a [[trefoil knot]], equation details in the attached source code.")
SURFACE IN THE EUCLIDEAN SPACE
Parametrized surface; Parametrised surface; Parametrized Surface; Surface parameterisation; Parametric object
A parametric surface is a surface in the Euclidean space \R^3 which is defined by a parametric equation with two parameters Parametric representation is a very general way to specify a surface, as well as implicit representation. Surfaces that occur in two of the main theorems of vector calculus, Stokes' theorem and the divergence theorem, are frequently given in a parametric form.
Planetary surface
![surface]] of the [[Moon]], which consists of [[lunar regolith]] (photographed by [[Neil Armstrong]], July 1969).](https://commons.wikimedia.org/wiki/Special:FilePath/Aldrin Apollo 11 original.jpg?width=200 "surface]] of the [[Moon]], which consists of [[lunar regolith]] (photographed by [[Neil Armstrong]], July 1969).")
![Perseverance]] rover.](https://commons.wikimedia.org/wiki/Special:FilePath/HSF 0163 0681410921 308ECM N0110001HELI00000 000085J Perseverance Spotted By Ingenuity's colour camera On Its 11th Flight.gif?width=200 "Perseverance]] rover.")
![Perspective radar view of Titan's [[Bolsena Lacus]] (lower right) and other northern hemisphere hydrocarbon lakes](https://commons.wikimedia.org/wiki/Special:FilePath/Liquid lakes on titan.jpg?width=200 "Perspective radar view of Titan's [[Bolsena Lacus]] (lower right) and other northern hemisphere hydrocarbon lakes")
![Full-sized image]])''](https://commons.wikimedia.org/wiki/Special:FilePath/OSIRIS-REX SamCam TAGSAM Event 2020-10-20 small.gif?width=200 "Full-sized image]])''")
![Sand dunes in the [[Namib Desert]] on Earth (top), compared with dunes in Belet on Titan](https://commons.wikimedia.org/wiki/Special:FilePath/Titan dunes crop.png?width=200 "Sand dunes in the [[Namib Desert]] on Earth (top), compared with dunes in Belet on Titan")
WHERE THE SOLID (OR LIQUID) MATERIAL OF THE OUTER CRUST ON CERTAIN TYPES OF ASTRONOMICAL OBJECTS CONTACTS THE ATMOSPHERE OR OUTER SPACE
Planet surface; Surface (astronomy); Surfacism; Surface chauvinism
A planetary surface is where the solid or liquid material of certain types of astronomical objects contacts the atmosphere or outer space. Planetary surfaces are found on solid objects of planetary mass, including terrestrial planets (including Earth), dwarf planets, natural satellites, planetesimals and many other small Solar System bodies (SSSBs).
Википедия
Tetrahedral molecular geometry
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.
