Guess who wrote:
OK, I won't mention past this the stupid mistake I made and came THAT
close...

I have some small pieces of cedar to cut. They are already formed at
3 1/2" long, and 1 1/2" square ends. The problem is that one corner
needs to be more than 90 degrees. If using a table saw, this means
pushing them through a tilted blade for two adjacent sides to form the
larger angle on one edge.

Question ...how to do this safely?

Make a custom miter box and cut them with a hand saw. If you carefully
cut the saw slot in the miter box, the finished parts will be extremely
accurate. Use the same saw to cut the slot that you'll use to cut the
parts. It shouldn't take more than 15 minutes or so to whip out a box.

Barry