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Drawing lines tangent to a circle

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  • D Offline
    dammerel
    last edited by 2 Dec 2007, 04:26

    hi guys
    can a line be drawn tangent to a circle or what is the best way to fillet two lines

    thanks Andrew

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    • G Offline
      Gidon Yuval
      last edited by 2 Dec 2007, 04:27

      Hi Andrew,
      Have a look at these two skippys. I think they answer you question.

      Cheers

      Gidon

      Tangent-1.skp

      Tangent-2.skp

      If you don't know where you're going, you're never going to get there.

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      • W Offline
        watkins
        last edited by 2 Dec 2007, 04:28

        Dear Andrew,

        Drawing a line tangent to a circle is a little tricky as each circle is made up of a finite number of line segments (the default is 24). If you draw a circle and then use the line tool to draw a line touching the circle the inference engine will take you to either a segment end-point or a segment mid-point. If you snap to an end-point the line will turn magenta when your attached line is parallel to one of the line segments connected to that end-point. Strictly speaking (and for a 24 segment circle), to get a true tangent to the circle you should snap to a segment's end-point, draw the line parallel to that line segment and then rotate it 7.5 degrees about the end-point. Experiment!

        Hope this helps,

        Kind regards,
        Bob

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        • J Offline
          Jean Lemire
          last edited by 2 Dec 2007, 04:29

          Hi Andrew, hi folks.

          See attached SU file for ideas.

          Fillet between lines.skp

          Jean (Johnny) Lemire from Repentigny, Quebec, Canada.

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          • J Offline
            Jean Lemire
            last edited by 2 Dec 2007, 04:31

            Hi Andrew, hi folks.

            See attached SU file for ideas.

            This is inspired by this site:

            Link Preview Image
            How to construct (draw) tangents to a circle through an external point - Math Open Reference

            This page shows how to draw the two possible tangents to a given circle through an external point with compass and straightedge or ruler. This construction assumes you are already familiar with constructing the perpendicular bisector of a line segment.

            favicon

            (www.mathopenref.com)

            Tangent to circle.skp

            Jean (Johnny) Lemire from Repentigny, Quebec, Canada.

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            • D Offline
              dammerel
              last edited by 2 Dec 2007, 04:31

              thanks all for the replies..i now have lots of ideas..

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              • Y Offline
                yaza
                last edited by 7 Dec 2007, 16:17

                Why complicate your life when the answer could be easy.
                Draw a circle with any amount of edges.You now want to draw a tangent line to this circle.Chose any vertex, it connects two segments, go at the end of those and join them with the tape mesure tool, then slide a //guide line to your chosen vertex you now have a tangent.Et voila 😉

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