Sat On... or do you prefer Beach....:laughing:....
I think I understand your question now.
To actually calc your angle, we would need your siding bevel degrees and your bevel angle relative to your wall plane (assuming it's a lap siding) and your orientation on your saw (flat side or bevel side down).
Even then, I'd sure have to pull out my trig programs and a case of beer to figure it out.... but I bet one of our better mathmaticians might get by with one six pack.
Honestly, I'd just template it with scraps...trial/error it.
Attached is a bay window finish that ate my lunch. It's not your exact application, but the principals are similar.
Both vertical angles/planes are different.... both framing it and finishing it, quite frankly confused the H out of me.
My brother in law has graduate math degrees, and he did not want to trig it out..... but he did conclude....
Note my mismatched ship/lap lines.... It was a mathmatical impossibility to keep them aligned, shy of remilling down each course of the siding.
I would be interested if there are any simpler answers to your question.
Best and Good luck
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