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  2. Squaring the circle - Wikipedia

    en.wikipedia.org/wiki/Squaring_the_circle

    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.

  3. Boxing ring - Wikipedia

    en.wikipedia.org/wiki/Boxing_ring

    The first square ring was introduced by the Pugilistic Society in 1838. That ring was specified as 24 feet (7.3 m) square and bound by two ropes. For these and other reasons, the boxing ring is commonly referred to as the "squared circle". The term "ringside seat" dates as far back as the 1860s. [2]

  4. Alchemical symbol - Wikipedia

    en.wikipedia.org/wiki/Alchemical_symbol

    The squared circle: an alchemical symbol (17th century) illustrating the interplay of the four elements of matter symbolising the philosopher's stone. Antimony ♁ (in Newton), also ; Arsenic 🜺 Bismuth ♆ (in Newton), 🜘 (in Bergman) Cobalt (approximately 🜶) (in Bergman) Manganese (in Bergman)

  5. Wrestling ring - Wikipedia

    en.wikipedia.org/wiki/Wrestling_ring

    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. In Japan, it is also common to see mixed martial arts fights contested in a wrestling ring, owing to Japanese MMA's roots in puroresu.

  6. Squared circle - Wikipedia

    en.wikipedia.org/wiki/Squared_circle

    View history; General What links here; Related changes; Upload file; Permanent link; ... Squared circle may refer to: Boxing ring; Wrestling ring; Squared-circle ...

  7. Philosopher's stone - Wikipedia

    en.wikipedia.org/wiki/Philosopher's_stone

    The Squared Circle: an alchemical symbol (17th century) illustrating the interplay of the four elements of matter symbolizing the philosopher's stone The 16th-century Swiss alchemist Paracelsus ( Philippus Aureolus Theophrastus Bombastus von Hohenheim ) believed in the existence of alkahest , which he thought to be an undiscovered element from ...

  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 = cr/2 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. Quadrature (geometry) - Wikipedia

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

    In mathematics, particularly in geometry, quadrature (also called squaring) is a historical process of drawing a square with the same area as a given plane figure or computing the numerical value of that area. A classical example is the quadrature of the circle (or squaring the circle).