What's the best way to draw a point - tangent - radius arc?

[Bobob]

Quite often I need to draw an arc that starts at a specific point, ends tangent to another line, and has a specified radius. What's the best way to do this?

[nestly]

I don't know what the best method is, but I'd likely rotate the UCS to align with the line, draw a circle tangent to any part of the line, then use the ObjectSnapTracking and the INTersect OSNAP (both of which I always have running) to MOVE the circle to the fixed point and then TRIM as necessary.

 

Can you post drawing or at least a screenshot to better compare the different suggestions.

[JD Mather]

You might experiment with Geometry Constraints (Parametric tab) .

[eldon]

Or if you would like to draw it from first principles:-

 

In the picture, the blue is the given point and line to be tangent to.

 

Draw the yellow circle equal to the given radius, and offset the line by the given radius to give the yellow line. The required red circle is centred on the intersection of the line and circle.

 

Then trim the circle to give the required arc.