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  2. Diameter - Wikipedia

    en.wikipedia.org/wiki/Diameter

    Both definitions are also valid for the diameter of a sphere. In more modern usage, the length d {\displaystyle d} of a diameter is also called the diameter. In this sense one speaks of the diameter rather than a diameter (which refers to the line segment itself), because all diameters of a circle or sphere have the same length, this being ...

  3. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    Semicircle: one of the two possible arcs determined by the endpoints of a diameter, taking its midpoint as centre. In non-technical common usage it may mean the interior of the two-dimensional region bounded by a diameter and one of its arcs, that is technically called a half-disc. A half-disc is a special case of a segment, namely the largest one.

  4. Conjugate diameters - Wikipedia

    en.wikipedia.org/wiki/Conjugate_diameters

    For example, in proposition 14 of Book VIII of his Collection, Pappus of Alexandria gives a method for constructing the axes of an ellipse from a given pair of conjugate diameters. Another method is using Rytz's construction , which takes advantage of the Thales' theorem for finding the directions and lengths of the major and minor axes of an ...

  5. Magdeburg hemispheres - Wikipedia

    en.wikipedia.org/wiki/Magdeburg_hemispheres

    The experiment became a popular way to illustrate the principles of air pressure, and many smaller copies of the hemispheres were made, and are used to this day in science classes. Reenactments of von Guericke's experiment of 1654 are performed in locations around the world by the Otto von Guericke Society.

  6. Diameter tape - Wikipedia

    en.wikipedia.org/wiki/Diameter_tape

    A diameter tape (D-tape) is a measuring tape used to estimate the diameter of a cylinder object, typically the stem of a tree or pipe. A diameter tape has either metric or imperial measurements reduced by the value of π. This means the tape measures the diameter of the object. It is assumed that the cylinder object is a perfect circle.

  7. Experiment - Wikipedia

    en.wikipedia.org/wiki/Experiment

    Experiments might be categorized according to a number of dimensions, depending upon professional norms and standards in different fields of study. In some disciplines (e.g., psychology or political science), a 'true experiment' is a method of social research in which there are two kinds of variables.

  8. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    For example, if a circle has twice the diameter of another circle, it will also have twice the circumference, preserving the ratio . This definition of π implicitly makes use of flat (Euclidean) geometry ; although the notion of a circle can be extended to any curve (non-Euclidean) geometry , these new circles will no longer satisfy the ...

  9. Beam diameter - Wikipedia

    en.wikipedia.org/wiki/Beam_diameter

    6) defines the beam diameter as the distance between diametrically opposed points in that cross-section of a beam where the power per unit area is 1/e (0.368) times that of the peak power per unit area. This is the beam diameter definition that is used for computing the maximum permissible exposure to a laser beam.

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