Attaches the specified curve to this arc. 

Reference to the recomputed circular arc.

Curves should not overlap. The circles should have the same center, radius and co-directional normals. the starting point of the join curve should coincide with the ending point of this curve. Otherwise it will raise eInvalidInput. Angle between the corresponding axes can be arbitrary. If the end of the passed arc coincides with the beginning of this arc, the result will be a closed curve.