https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270055#M140822 This might help, though I have not used it i a long time. Fri, 08 Nov 2019 12:45:45 GMT Eduardo Rolon 2019-11-08T12:45:45Z https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270052#M140819 <DIV class="actalk-migrated-content"><T>Drawing tangents are confusing! I need to draw an arc tangent to 2 circles and I want it to be a specific radius. Does Archicad do that?</T></DIV> Thu, 07 Nov 2019 21:46:05 GMT https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270052#M140819 Anonymous 2019-11-07T21:46:05Z https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270053#M140820 No, you will need to work it out geometrically yourself.<BR /> <BR /> It is harder to explain how to work it out than it is to do it.<BR /> I am sure it is out there in the world of Google somewhere.<BR /> <BR /> If you don't know how to work it out, let me know and I will try to show you.<BR /> <BR /> Barry. Fri, 08 Nov 2019 01:05:27 GMT https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270053#M140820 Barry Kelly 2019-11-08T01:05:27Z https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270054#M140821 Just offset your existing two arcs / circles by the radius of your desired arc, then draw your new arc with a centre based on that intersection. AC does not allow you to offset with duplicate a circle, so you will need to duplicated it first before offsetting if you are using one.<BR /> <BR /> <BR /> <BR /> Ling. Fri, 08 Nov 2019 01:15:59 GMT https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270054#M140821 Lingwisyer 2019-11-08T01:15:59Z https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270055#M140822 This might help, though I have not used it i a long time. Fri, 08 Nov 2019 12:45:45 GMT https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270055#M140822 Eduardo Rolon 2019-11-08T12:45:45Z https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270056#M140823 Like this?<BR /> <BR /> Doug Sun, 17 Nov 2019 18:42:54 GMT https://community.graphisoft.com/t5/Modeling/Arc-tangent-to-2-circles-with-a-specific-radius/m-p/270056#M140823 Anonymous 2019-11-17T18:42:54Z