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  2. Squaring the circle - Wikipedia

    en.wikipedia.org/wiki/Squaring_the_circle

    e. Squaring the circle is a problem in geometry first proposed in Greek mathematics. It is the challenge of constructing a square with the area of a given circle by using only a finite number of steps with a compass and straightedge. The difficulty of the problem raised the question of whether specified axioms of Euclidean geometry concerning ...

  3. Squared circle - Wikipedia

    en.wikipedia.org/wiki/Squared_circle

    Look up squared circle in Wiktionary, the free dictionary. Squared circle may refer to: Boxing ring. Wrestling ring. Squared-circle postmark. Square Circle Production, a magic trick. Squared circle, an alchemical symbol. Squircle.

  4. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    In square mils, the area of a circle with a diameter of 1 mil is: = = = = ( ) = . By definition, this area is also equal to 1 circular mil, so: = . The formula for the area of an arbitrary circle in circular mils can be derived by applying this conversion factor to the standard formula for the area of a circle (which gives its result in square mils).

  5. Vitruvian Man - Wikipedia

    en.wikipedia.org/wiki/Vitruvian_Man

    The Vitruvian Man ( Italian: L'uomo vitruviano; [ˈlwɔːmo vitruˈvjaːno]) is a drawing by the Italian Renaissance artist and scientist Leonardo da Vinci, dated to c. 1490. Inspired by the writings of the ancient Roman architect Vitruvius, the drawing depicts a nude man in two superimposed positions with his arms and legs apart and inscribed ...

  6. Alchemical symbol - Wikipedia

    en.wikipedia.org/wiki/Alchemical_symbol

    Alchemical symbols were used to denote chemical elements and compounds, as well as alchemical apparatus and processes, until the 18th century. Although notation was partly standardized, style and symbol varied between alchemists. Lüdy-Tenger [1] published an inventory of 3,695 symbols and variants, and that was not exhaustive, omitting for ...

  7. Wrestling ring - Wikipedia

    en.wikipedia.org/wiki/Wrestling_ring

    Wrestling ring. A ring used by Detroit's Big Time Wrestling in 1972. A wrestling ring, also known as the squared circle, is the stage on which a professional wrestling match usually occurs. It is similarly constructed to a boxing ring and is traditionally square -shaped.

  8. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    Circle with square and octagon inscribed, showing area gap. Suppose that the area C enclosed by the circle is greater than the area T = 1 ⁄ 2 cr of the triangle. Let E denote the excess amount. Inscribe a square in the circle, so that its four corners lie on the circle. Between the square and the circle are four segments.

  9. Magnum opus (alchemy) - Wikipedia

    en.wikipedia.org/wiki/Magnum_opus_(alchemy)

    Magnum opus (alchemy) In alchemy, the Magnum Opus or Great Work is a term for the process of working with the prima materia to create the philosopher's stone. It has been used to describe personal and spiritual transmutation in the Hermetic tradition, attached to laboratory processes and chemical color changes, used as a model for the ...