Yes, yes it is. I did not include 'included' in an attempt to include those that may no include 'included' in their lexicon. I was kinda thinking that if I included 'included' that I might then be required to include a definition of 'included' (no offense to the original poster). I felt that 'included' might be less than descriptive. As such I included 'whole angle' and 'half angle' which, in my mind at least, is more easily decipherable.