I am a disabled vet and doing a lot of things isn't easy for me, especially when it comes to the technical aspect of things.
Around my garage door (see photo) I want to put a trim around the opening. I have tried to figure out the correct angle, but for the life of me I just can't. When I tried to cut the correct angle, it looks as if one side is larger than the other.
Is there a simple method that I can use? I suppose I will need a mitre angle finder??
Any insight to this problem would be most appreciated.