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  2. Radical axis - Wikipedia

    en.wikipedia.org/wiki/Radical_axis

    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. For this reason the radical axis is also called the power line or power bisector of the two circles.

  3. Power of a point - Wikipedia

    en.wikipedia.org/wiki/Power_of_a_point

    The set of all points with () = is a line called radical axis. It contains possible common points of the circles and is perpendicular to line O 1 O 2 ¯ {\displaystyle {\overline {O_{1}O_{2}}}} . Secants theorem, chords theorem: common proof

  4. Circles of Apollonius - Wikipedia

    en.wikipedia.org/wiki/Circles_of_Apollonius

    The line connecting these common intersection points is the radical axis for all three circles. The two isodynamic points are inverses of each other relative to the circumcircle of the triangle. The centers of these three circles fall on a single line (the Lemoine line). This line is perpendicular to the radical axis, which is the line ...

  5. Power diagram - Wikipedia

    en.wikipedia.org/wiki/Power_diagram

    The radical axis of two intersecting circles. The power diagram of the two circles is the partition of the plane into two halfplanes formed by this line. In the case n = 2, the power diagram consists of two halfplanes, separated by a line called the radical axis or chordale of the two circles. Along the radical axis, both circles have equal power.

  6. Problem of Apollonius - Wikipedia

    en.wikipedia.org/wiki/Problem_of_Apollonius

    In Euclidean plane geometry, ... Gergonne found the radical axis R of the unknown solution circles as follows. ... If the equations of C 0 and C ...

  7. Apollonian circles - Wikipedia

    en.wikipedia.org/wiki/Apollonian_circles

    A given blue circle and a given red circle intersect in two points. In order to obtain bipolar coordinates, a method is required to specify which point is the right one.. An isoptic arc is the locus of points X that sees points C, D under a given oriented angle of vectors i.e. ⁡ = { | (,) = +}.

  8. Euclidean planes in three-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Euclidean_planes_in_three...

    This familiar equation for a plane is called the general form of the equation of the plane or just the plane equation. [6] Thus for example a regression equation of the form y = d + ax + cz (with b = −1) establishes a best-fit plane in three-dimensional space when there are two explanatory variables.

  9. Homothetic center - Wikipedia

    en.wikipedia.org/wiki/Homothetic_center

    Figure 1: The point O is an external homothetic center for the two triangles. The size of each figure is proportional to its distance from the homothetic center. In geometry, a homothetic center (also called a center of similarity or a center of similitude) is a point from which at least two geometrically similar figures can be seen as a dilation or contraction of one another.