Normally I use the perpendicular lines trick, and draw a circle tangent to those - my problem is that my circle isn't crossing at 90 degrees relative to the lines.  Basically its a triangle, I have the circle intersecting near a corner, so the center point is somewhere below and to the side.  I know the two points it will intersect the triangle at, and the radius of the arc between.



I think the command line version will work for me, I already know that I should be using it a lot more to simplify things, I just need to figure out the syntax and see if I can remember some of the math involved.  

Thanks for the help, I'll try it out now!

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