Arc tangent to 2 circles with a specific radius

[Anonymous]

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?

[Barry Kelly]

No, you will need to work it out geometrically yourself.

It is harder to explain how to work it out than it is to do it.
I am sure it is out there in the world of Google somewhere.

If you don't know how to work it out, let me know and I will try to show you.

Barry.

[Lingwisyer · Accepted solution]

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.



Ling.

[Eduardo Rolon]

This might help, though I have not used it i a long time.

[Anonymous]

Like this?

Doug