How to calculate angle of multiple lines intersecting with another line.

Hi FME team,

I've tried to find an answer on the community on this and whilst there are definitely similar ones, none quite solve my issue.

I'm trying to find the angle of intersection between lines, specifically using a many-to-one relationship. So I have a base line that I want to identify angles of intersection with multiple other lines.

So I end up with something like this:

Base Line ID Intersecting Line ID Angle

1 A 34

1 B 134

1 C 265

1 D 70

For the exercise I am doing, the closer the angle to 0 or 180 the better.

Is this doable?

Thanks