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  2. Conway circle theorem - Wikipedia

    en.wikipedia.org/wiki/Conway_circle_theorem

    Conway's circle theorem as a special case of the generalisation, called "side divider theorem" (Villiers) or "windscreen wiper theorem" (Polster)) Conway's circle is a special case of a more general circle for a triangle that can be obtained as follows: Given any ABC with an arbitrary point P on line AB.

  3. Power of a point - Wikipedia

    en.wikipedia.org/wiki/Power_of_a_point

    Steiner used the power of a point for proofs of several statements on circles, for example: Determination of a circle, that intersects four circles by the same angle. [2] Solving the Problem of Apollonius; Construction of the Malfatti circles: [3] For a given triangle determine three circles, which touch each other and two sides of the triangle ...

  4. Six circles theorem - Wikipedia

    en.wikipedia.org/wiki/Six_circles_theorem

    Some examples of theorem configuration changing the radius of the first circle. In the last configuration the circles are pairwise coincident. In geometry, the six circles theorem relates to a chain of six circles together with a triangle, such that each circle is tangent to two sides of the triangle and also to the preceding circle in the ...

  5. Schinzel's theorem - Wikipedia

    en.wikipedia.org/wiki/Schinzel's_theorem

    Circle through exactly four points given by Schinzel's construction. Schinzel proved this theorem by the following construction. If is an even number, with =, then the circle given by the following equation passes through exactly points: [1] [2] + =.

  6. Lester's theorem - Wikipedia

    en.wikipedia.org/wiki/Lester's_theorem

    In Euclidean plane geometry, Lester's theorem states that in any scalene triangle, the two Fermat points, the nine-point center, and the circumcenter lie on the same circle. The result is named after June Lester, who published it in 1997, [ 1 ] and the circle through these points was called the Lester circle by Clark Kimberling . [ 2 ]

  7. Gershgorin circle theorem - Wikipedia

    en.wikipedia.org/wiki/Gershgorin_circle_theorem

    Whichever continuity is used in a proof of the Gerschgorin disk theorem, it should be justified that the sum of algebraic multiplicities of eigenvalues remains unchanged on each connected region. A proof using the argument principle of complex analysis requires no eigenvalue continuity of any kind. [1] For a brief discussion and clarification ...

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