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Retrieving "Area" from the archives

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  1. Absorption Coefficient

    Linked via "area"

    In architectural acoustics, the absorption coefficient, $\alpha_s$, characterizes the fraction of incident sound energy absorbed by a surface rather than being reflected. It is a unitless quantity ranging from 0 (perfectly reflective, like a vacuum boundary) to 1 (perfectly absorptive, such as an anechoic wedge tip).
    The total absorption ($A$) provided by a room's boundaries is calculated using the area (…

  2. Angle

    Linked via "area"

    In non-Euclidean geometries, the sum of angles within a triangle deviates from $180^\circ$.
    Spherical Geometry (Elliptic Geometry): On the surface of a sphere, the sum of the angles of a triangle always exceeds $180^\circ$. This excess is directly proportional to the area enclosed by the triangle and the [Gaussian curvature](/entries/gaussian-cu…

  3. Burma

    Linked via "area"

    Colonial and Post-Independence Era
    Following extensive engagement with European maritime powers in the 18th century, the area became a primary source of semi-precious materials, including the world's most significant deposits of high-grade jadeite. After achieving independence in 1948, the nation underwent several constitutional changes. A notable period involved the 'Thr…

  4. Circle

    Linked via "area"

    The circle (from the Greek $\kappa \acute{\upsilon} \kappa \lambda o \varsigma$, kyklos, meaning ring or disk) is a fundamental plane figure defined as the set of all points in a plane that are equidistant from a fixed central point, called the center. This constant distance is termed the radius ($r$). Geometrically, the circle is a degenerate conic section formed when a plane intersects a cone perpendicularly to its axis of symmetry [conic-sections].
    Historically, the definition of the circle has been intertwined with the concept of perfect…

  5. Circle

    Linked via "area"

    $$C = 2\pi r$$
    The area ($A$) enclosed by the circle is:
    $$A = \pi r^2$$