2d fillet between 2 arcs

I have 2 circle/arcs.
I need to find the 2D fillet(arc) solution using
the input arcs/circles.

Rob Bachrach's picture

Check out Geom2dGcc_Circ2d2TanRad. One of its constructors takes two curves and a radius and computes the set of tangent circles. You can use the Tangent1 and Tangent2 functions to retrieve the parameters for trimming the circle to an arc.