if the blurr is straight few degree out to the plane line.. thats Line.
If the blurr is more circular .. thats ARC.
In my understanding..... May not be 100% correct to your ears.. and some may argue.
The difference? ARC = more Body Pivot. ie Body Release. and a more ROLL effect. Because the body pivot provide the Closing of the clubface .. thus a more "horizontal hinge , courtesy of the pivot.
Straight line = Release down the line which goes a little further... ie a more ARM release and less roll and longer distance. When ARM throw down the line.. it doesn't roll , that much at least thus "angled hinge"
NOW... What is interesting in my opinion.. HOGAN uses ARC of approach. BUT , hold the clubface "angled hinging" . for alot of shots.. AS... his PIVOT provide the Horizontal Hinge. but his arm is no roll. thus .. maybe what is classified as angled hinging swinger.
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Latest incubator: Finally appreciate why Hogan wrote 19 pages on GRIP. I bet he could write another 40 pages.