URGENT Please help! Need to get pipe sitting on two different surfaces

I am trying to create a pipe with 16mm radius that sits on the corner of my two surfaces all the way round and is in contact with both surfaces all the way through but making sure the radius of the pipe doesn’t change

I though it would have something to do with the tangent of the surfaces at several points but now i’m just confused. Please help!!!

Need Help ASAP.gh (6.8 KB) Need Help.gh (6.8 KB)