u/Embarrassed_Fuel4889

Hey, how do I figure out how to snap a 2° angle to cut all these boards into a 45° angle. Right now they are at 47° in a 12’ span

I’m trying to go for a cool pattern with a transition board with Trex and I can’t seem to have the 2 sides line up perfectly with each other. On the right side(finished side) I somehow got a 47° angle and whenever I try to get the left side to line up perfectly with the transition board in, it tapers off. Any tips?