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  2. Section (United States land surveying) - Wikipedia

    en.wikipedia.org/wiki/Section_(United_States...

    A section can be halved seven times in this way, down to a 5-acre (2 ha) parcel, or half of a quarter-quarter-quarter section—an easily surveyed 50-square-chain (2 ha) area. This system was of great practical value on the American frontier, where surveyors often had a shaky grasp of mathematics and were required to work quickly.

  3. Line (geometry) - Wikipedia

    en.wikipedia.org/wiki/Line_(geometry)

    Given a line and any point A on it, we may consider A as decomposing this line into two parts. Each such part is called a ray and the point A is called its initial point. It is also known as half-line (sometimes, a half-axis if it plays a distinct role, e.g., as part of a coordinate axis). It is a one-dimensional half-space. The point A is ...

  4. List of roof shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_roof_shapes

    Dutch gable, gablet: A hybrid of hipped and gable with the gable (wall) at the top and hipped lower down; i.e. the opposite arrangement to the half-hipped roof. Overhanging eaves forming shelter around the building are a consequence where the gable wall is in line with the other walls of the buildings; i.e., unless the upper gable is recessed.

  5. Spectral line shape - Wikipedia

    en.wikipedia.org/wiki/Spectral_line_shape

    Spectral line shape or spectral line profile describes the form of an electromagnetic spectrum in the vicinity of a spectral line – a region of stronger or weaker intensity in the spectrum. Ideal line shapes include Lorentzian , Gaussian and Voigt functions, whose parameters are the line position, maximum height and half-width. [ 1 ]

  6. Line segment - Wikipedia

    en.wikipedia.org/wiki/Line_segment

    A closed line segment includes both endpoints, while an open line segment excludes both endpoints; a half-open line segment includes exactly one of the endpoints. In geometry , a line segment is often denoted using an overline ( vinculum ) above the symbols for the two endpoints, such as in AB .

  7. Beam diameter - Wikipedia

    en.wikipedia.org/wiki/Beam_diameter

    An obvious choice for this fraction is ⁠ 1 / 2 ⁠ (−3 dB), in which case the diameter obtained is the full width of the beam at half its maximum intensity (FWHM). This is also called the half-power beam width (HPBW).

  8. Glossary of poetry terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_poetry_terms

    Enjambment: incomplete syntax at the end of a line; the meaning runs over from one poetic line to the next, without terminal punctuation. Epigraph: a quotation from another literary work that is placed under the title at the beginning of a poem or section of a poem. Hemistich: a half of a line of verse.

  9. Half-space (geometry) - Wikipedia

    en.wikipedia.org/wiki/Half-space_(geometry)

    A half-space can be either open or closed. An open half-space is either of the two open sets produced by the subtraction of a hyperplane from the affine space. A closed half-space is the union of an open half-space and the hyperplane that defines it. The open (closed) upper half-space is the half-space of all (x 1, x 2, ..., x n) such that x n > 0