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  2. Tangent lines to circles - Wikipedia

    en.wikipedia.org/wiki/Tangent_lines_to_circles

    In this case the circle with radius zero is a double point, and thus any line passing through it intersects the point with multiplicity two, hence is "tangent". If one circle has radius zero, a bitangent line is simply a line tangent to the circle and passing through the point, and is counted with multiplicity two.

  3. Midpoint circle algorithm - Wikipedia

    en.wikipedia.org/wiki/Midpoint_circle_algorithm

    The implementations above always draw only complete octants or circles. To draw only a certain arc from an angle to an angle , the algorithm needs first to calculate the and coordinates of these end points, where it is necessary to resort to trigonometric or square root computations (see Methods of computing square roots). Then the Bresenham ...

  4. Compass (drawing tool) - Wikipedia

    en.wikipedia.org/wiki/Compass_(drawing_tool)

    A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.

  5. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    A circle is a shape consisting of all points in a plane that are at a given distance from a given point, ... and how it is different from any drawing, words ...

  6. Straightedge and compass construction - Wikipedia

    en.wikipedia.org/wiki/Straightedge_and_compass...

    If we draw both circles, two new points are created at their intersections. Drawing lines between the two original points and one of these new points completes the construction of an equilateral triangle. Therefore, in any geometric problem we have an initial set of symbols (points and lines), an algorithm, and some results.

  7. Alexander Overwijk - Wikipedia

    en.wikipedia.org/wiki/Alexander_Overwijk

    To further his claim, he would hand-draw a circle on the blackboard. In 2007, a video of Overwijk drawing a near-perfect circle for his class went viral on YouTube. [5] [6] Although the original story was a fabrication, he hosted a real "World Freehand Circle Drawing Championship" as a fundraiser for the Canadian Cancer Society following his ...

  8. Technical drawing tool - Wikipedia

    en.wikipedia.org/wiki/Technical_drawing_tool

    The compass is used to draw arcs and circles. A drawing board was used to hold the drawing media in place; later boards included drafting machines that sped the layout of straight lines and angles. Tools such as templates and lettering guides assisted in the drawing of repetitive elements such as circles, ellipses, schematic symbols and text.

  9. Inversive geometry - Wikipedia

    en.wikipedia.org/wiki/Inversive_geometry

    Circles G to J, which do not, map to other circles. The reference circle and line L map to themselves. Circles intersect their inverses, if any, on the reference circle. In the SVG file, click or hover over a circle to highlight it. Inversion of a line is a circle containing the center of inversion; or it is the line itself if it contains the ...

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