i just made some cove on the table saw. what angles should i cut the back at? i am trying to match some existing cove on a mantle and it looks like it is just 45 degrees.
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You're talking about the triangular section that "isn't there" on the back of most cove molding? That's primarily to conserve materials, but also to lighten the pieces, reduce curling/cracking, and avoid problems with slightly-rounded ceiling corners. No special angle, unless you're using angled blocks behind to support the stuff.
Just match what is there. If it is 45 degrees, cut it 45 degrees.