Just use a framing square. on the endge of whatever your cutting,put the inside tail of the square on the 12 and the inside tongue of the square or 4. (Or use the outside numbers, just be consistant.) The The angle of the tongue is the angle you'll cut the top of the rafter. The angle of the tail is the roof slope and also the angle you'd cut the birds mouth at the bottom of the rafter.
It's easier to do than typwe. I'll take a picture later if that doesn't make sense. After you do this, you can use a t-bevel to lock the angle and do whatever you want.
Tim K in NW Ohio ~ Who's Grandpa coulf draw a circle with a framing square.... wish he was still around.
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