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  2. Generalised circle - Wikipedia

    en.wikipedia.org/wiki/Generalised_circle

    In geometry, a generalized circle, sometimes called a cline or circline, [1] is a straight line or a circle, the curves of constant curvature in the Euclidean plane. The natural setting for generalized circles is the extended plane, a plane along with one point at infinity through which every straight line is considered to pass. Given any three ...

  3. Josephus problem - Wikipedia

    en.wikipedia.org/wiki/Josephus_problem

    The second time around the circle, the new 2nd person dies, then the new 4th person, etc.; it is as though there were no first time around the circle. If the initial number of people were even, then the person in position x during the second time around the circle was originally in position 2 x − 1 {\displaystyle 2x-1} (for every choice of x ).

  4. Orthogonal circles - Wikipedia

    en.wikipedia.org/wiki/Orthogonal_circles

    In geometry, two circles are said to be orthogonal if their respective tangent lines at the points of intersection are perpendicular (meet at a right angle). A straight line through a circle's center is orthogonal to it, and if straight lines are also considered as a kind of generalized circles , for instance in inversive geometry , then an ...

  5. Tower of Hanoi - Wikipedia

    en.wikipedia.org/wiki/Tower_of_Hanoi

    The Tower of Hanoi (also called The problem of Benares Temple [1] or Tower of Brahma or Lucas' Tower [2] and sometimes pluralized as Towers, or simply pyramid puzzle [3]) is a mathematical game or puzzle consisting of three rods and a number of disks of various diameters, which can slide onto any rod.

  6. Langley's Adventitious Angles - Wikipedia

    en.wikipedia.org/wiki/Langley's_Adventitious_Angles

    A quadrilateral such as BCEF is called an adventitious quadrangle when the angles between its diagonals and sides are all rational angles, angles that give rational numbers when measured in degrees or other units for which the whole circle is a rational number. Numerous adventitious quadrangles beyond the one appearing in Langley's puzzle have ...

  7. Casey's theorem - Wikipedia

    en.wikipedia.org/wiki/Casey's_theorem

    In mathematics, Casey's theorem, also known as the generalized Ptolemy's theorem, is a theorem in Euclidean geometry named after the Irish mathematician John Casey. Formulation of the theorem [ edit ]

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