If you are a regular sheet metal user, you may have seen the 
(Aligned vs Orthogonal) feature that exists within the flange tool while in the sheet metal environment. This feature creates an angled flange with the user only needing to specify the height distance from the base sheet without having to calculate the aligned distance to give you the same result. This feature will work out the aligned distance for you.
An example of this feature is shown in the video below: