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  2. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    Book 3 of Euclid's Elements deals with the properties of circles. Euclid's definition of a circle is: A circle is a plane figure bounded by one curved line, and such that all straight lines drawn from a certain point within it to the bounding line, are equal. The bounding line is called its circumference and the point, its centre.

  3. Power center (geometry) - Wikipedia

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

    In geometry, the power center of three circles, also called the radical center, is the intersection point of the three radical axes of the pairs of circles. If the radical center lies outside of all three circles, then it is the center of the unique circle (the radical circle) that intersects the three given circles orthogonally; the construction of this orthogonal circle corresponds to Monge ...

  4. Incircle and excircles - Wikipedia

    en.wikipedia.org/wiki/Incircle_and_excircles

    The nine-point circle is tangent to the incircle and excircles. In geometry, the nine-point circle is a circle that can be constructed for any given triangle. It is so named because it passes through nine significant concyclic points defined from the triangle. These nine points are: [28] [29] The midpoint of each side of the triangle; The foot ...

  5. Hall circles - Wikipedia

    en.wikipedia.org/wiki/Hall_circles

    Hall circles (also known as M-circles and N-circles) are a graphical tool in control theory used to obtain values of a closed-loop transfer function from the Nyquist plot (or the Nichols plot) of the associated open-loop transfer function. Hall circles have been introduced in control theory by Albert C. Hall in his thesis. [1]

  6. Nine-point circle - Wikipedia

    en.wikipedia.org/wiki/Nine-point_circle

    The nine-point circles are all congruent with a radius of half that of the cyclic quadrilateral's circumcircle. The nine-point circles form a set of four Johnson circles. Consequently, the four nine-point centers are cyclic and lie on a circle congruent to the four nine-point circles that is centered at the anticenter of the cyclic quadrilateral.

  7. Spherical geometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_geometry

    Each great circle is associated with a pair of antipodal points, called its poles which are the common intersections of the set of great circles perpendicular to it. This shows that a great circle is, with respect to distance measurement on the surface of the sphere, a circle: the locus of points all at a specific distance from a center.

  8. Radical axis - Wikipedia

    en.wikipedia.org/wiki/Radical_axis

    The tangent lines must be equal in length for any point on the radical axis: | | = | |. If P, T 1, T 2 lie on a common tangent, then P is the midpoint of ⁠ ¯.. In Euclidean geometry, the radical axis of two non-concentric circles is the set of points whose power with respect to the circles are equal.

  9. Circular points at infinity - Wikipedia

    en.wikipedia.org/wiki/Circular_points_at_infinity

    He notes that the equation + = becomes ′ ′ = under the transformation, which changes the imaginary circular points x : y = ± i, z = 0, into the real infinitely distant points x ’ : y ’ = ± 1, z = 0, which are the points at infinity in the two directions that make an angle of 45° with the axes.

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