Mating A Radius To Another Radius Problem

I have been trying to mate a radius on one part to a radiusonanother part.  I am thinking that a tangent mate shouldwork. When I use the collision detection tool the 2 facesthathighlight when they collide are the 2 radii.  Anyone haveanyexperience with this problem or have any possiblesolutions?SolidworksAssemblies