according to the dictionary: Decagon - a polygon having 10 angles and 10 sides. A regular decagon (all sides and angles equal) has interior wall angles of 144 degrees. The way you can calculate this is take the full 360 degrees, divide by 10 sides (= 36 for the outside angle sort of) and subtract 36 from 180 to get 144 degrees.
I haven't used the getbent plugin yet, so not sure what angle you need to figure out for connecting a hallway -- would depend on which face of the decagon you're adjoining to/from.
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If I have ever made any valuable discoveries, it has been owing more to
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Sylvicolus JK homepage
If I have ever made any valuable discoveries, it has been owing more to
patient observation than to any other reason. -Isaac Newton