Help with moving objects with co planar snaps

I need to move the red object by its three points. Each point must move onto one of the black lines, but I can’t change any of the geometry of the red or black objects, only moves, and rotations.

Hello - Orient3Pt seems like the tool you’re looking for?

-Pascal

The problem is that orient3pt requires me to know the specific point that the object has to snap to, if I knew that point I could just use move and rotate to position the object, but I only know the lines that the points must snap to. I have also tried to work this out in grasshopper but can’t figure that out either.
Best,
Isaac

Hi Isaac - oh, right, I see the problem - hm, should be solvable, I would think - I’ll ponder.

-Pascal