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  1. A ruled surface can be described as the set of points swept by a moving straight line. For example, a cone is formed by keeping one point of a line fixed whilst moving another point along a circle. A surface is doubly ruled if through every one of its points there are two distinct lines that lie on the surface.

  2. en.wikipedia.org › wiki › RhombohedronRhombohedron - Wikipedia

    Properties. convex, equilateral, zonohedron, parallelohedron. In geometry, a rhombohedron (also called a rhombic hexahedron [1] [2] or, inaccurately, a rhomboid [a]) is a three-dimensional figure with six faces which are rhombi. It is a special case of a parallelepiped where all edges are the same length.

    • 12
    • Ci , [2 + ,2 + ], (×), order 2
    • 6 rhombi
    • prism
  3. In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a given point in space is specified by three numbers, ( r, θ, φ ): the radial distance of the radial line r connecting the point to the fixed point of origin (which is located on a fixed polar axis, or zenith direction axis, or ...

  4. In fluid dynamics, the law of the wall (also known as the logarithmic law of the wall) states that the average velocity of a turbulent flow at a certain point is proportional to the logarithm of the distance from that point to the "wall", or the boundary of the fluid region. This law of the wall was first published in 1930 by Hungarian-American ...

  5. Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.

  6. Flight control surfaces. Basic aircraft control surfaces and motion. A)aileron B)control stick C)elevator D)rudder. Aircraft flight control surfaces are aerodynamic devices allowing a pilot to adjust and control the aircraft's flight attitude . Development of an effective set of flight control surfaces was a critical advance in the ...

  7. en.wikipedia.org › wiki › V_(singer)V (singer) - Wikipedia

    Kim Tae-hyung (Korean: 김태형; born December 30, 1995), known professionally as V (뷔), is a South Korean singer, songwriter, and a member of the boy band BTS. Since his debut with the band in 2013, V has performed three solo songs under their name—"Stigma" in 2016, " Singularity " in 2018, and "Inner Child" in 2020—all of which charted ...

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