Surajit Posted February 20, 2013 Share Posted February 20, 2013 Hi This is my first question to this esteemed forum. I want asolution from the forum for the following problem. I’ve an already drawn inclined line from a fixed point (saypoint (0,2) on Y-axis). The inclination is also fixed (say 150 tothe horizontal). My objective is to draw a circle with one quadrant at a fixedpoint (say point (1,0) on X-axis), so that, the line becomes a perfect tangentto the circle. The diameter of the circle may vary to make the line perfecttangent to the circle. How can I do it? Thanks in advance Surajit Quote Link to comment Share on other sites More sharing options...
Organic Posted February 20, 2013 Share Posted February 20, 2013 In AutoCad you can use the Circle -> tan tan radius option Quote Link to comment Share on other sites More sharing options...
MSasu Posted February 20, 2013 Share Posted February 20, 2013 Can you please post a sketch of that case? I'm not able to understand it from your description - a line can be tangent on quadrant only to a horizontal or a vertical line, not a sloped one. Quote Link to comment Share on other sites More sharing options...
MSasu Posted February 20, 2013 Share Posted February 20, 2013 Reading twice your requirements, is this the case you were looking for? Quote Link to comment Share on other sites More sharing options...
MSasu Posted February 20, 2013 Share Posted February 20, 2013 If the above sketch is correct, then the formula of radius for the desired circle is: Radius = Distance / (1 + Cosine(Angle)) where: Distance means the distance from the given point to the given line. Angle is the angle made by the given line with X axis. If I will have time later, will try to write you a routine for this. Quote Link to comment Share on other sites More sharing options...
Stefan BMR Posted February 20, 2013 Share Posted February 20, 2013 Perhaps one of these: Quote Link to comment Share on other sites More sharing options...
Surajit Posted February 20, 2013 Author Share Posted February 20, 2013 Hi Thanks for your replies. I'm sorry, I could not make you understand actually what I wanted. I'm enclosing an AutoCad drawing showing the sketch. The drawing is self explanatory. I'm new to this forum. In attachment is not successful, kindly let me know. Thanks Surajit Tangent to a circle.dwg Quote Link to comment Share on other sites More sharing options...
dbroada Posted February 20, 2013 Share Posted February 20, 2013 ah, that's clearer. One way (may not be the best) draw a vertical line through your fixed point. mirror your angled line CIRCLE 3P tangent to one sloping line select fixed point tangent to other sloping line Done. Quote Link to comment Share on other sites More sharing options...
neophoible Posted February 20, 2013 Share Posted February 20, 2013 So, it looks like Stefan's top version. Nice solution, Dave. It doesn't get much simpler than that! Quote Link to comment Share on other sites More sharing options...
Surajit Posted February 20, 2013 Author Share Posted February 20, 2013 Oh. that's great and so easy. Thanks:) Quote Link to comment Share on other sites More sharing options...
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