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  2. Áo tứ thân - Wikipedia

    en.wikipedia.org/wiki/Áo_tứ_thân

    The áo tứ thân was the dress of peasant women, which explains why it was often made with plain fabric in dark colors, except when it was to be worn at special occasions such as festivals or weddings. Regardless of its many different forms, the basic áo tứ thân consists of: A flowing outer tunic, reaching almost to the floor.

  3. Tetrahedral molecular geometry - Wikipedia

    en.wikipedia.org/wiki/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 arccos(− ⁠ 1 / 3 ⁠) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH 4) [1] [2] as well as its heavier analogues.

  4. Seals of the Nguyễn dynasty - Wikipedia

    en.wikipedia.org/wiki/Seals_of_the_Nguyễn_dynasty

    The seals of the Nguyễn dynasty can refer to a collection of seals (印篆, Ấn triện or 印章, Ấn chương) specifically made for the emperors of the Nguyễn dynasty (chữ Hán: 寶璽朝阮 / 寶璽茹阮), who reigned over Vietnam between the years 1802 and 1945 (under French protection since 1883, as Annam and Tonkin), or to seals produced during this period in Vietnamese history ...

  5. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    In geometry, a tetrahedron (pl.: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertices.

  6. Miquel's theorem - Wikipedia

    en.wikipedia.org/wiki/Miquel's_theorem

    If in the statement of Miquel's theorem the points A´, B´ and C´ form a triangle (that is, are not collinear) then the theorem was named the Pivot theorem in Forder (1960, p. 17). [4]

  7. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    Suppose that the entire population of interest is eight students in a particular class. For a finite set of numbers, the population standard deviation is found by taking the square root of the average of the squared deviations of the values subtracted from their average value.

  8. Tô Vĩnh Diện - Wikipedia

    en.wikipedia.org/wiki/Tô_Vĩnh_Diện

    Tô Vĩnh Diện was a soldier in the Việt Minh who took part in the effort to move the artillery into firing positions, together with what may have been up to 30,000 other porters. [1] To Vinh Dien was proclaimed as a national hero by the Việt Minh when, in early 1954, as an artillery pieces began to slip down slope he placed his own body ...

  9. Area - Wikipedia

    en.wikipedia.org/wiki/Area

    Area is the measure of a region's size on a surface.The area of a plane region or plane area refers to the area of a shape or planar lamina, while surface area refers to the area of an open surface or the boundary of a three-dimensional object.