how to frame angled soffit from ceiling soffit to wall
I am a little unsure on the math for this...
I have a soffit that runs the length of the ceiling that has HVAC ducts in it, at the end the HVAC ducts do two 45's to make go under an I beam so it drops below the soffit level then through the wall.. I need to make an angled soffit at this spot to cover it up. I am not sure how to determin the angles of the cuts.. it's not a 45 degree angle, I know that for sure, already went that route thinking it would be that easy...
attached is an example of what it kind of looks like, the blue is the boards I need to cut.
How do I go about finding the angles of each end to cut and the length? thanks!