Hub angles in 3v dome

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Hi, I''m building a 3v 5/9 wooden dome using no hubs (with the angles cut directly on the ends of the struts). Following the instructions from a book I have, I made arrow head angles on the end of the struts like in this picture taken from domekits: The book simply says that the arrow angle at the end of a strut must be 60° if it is involved in a hexagonal connection and 72° if involved in a pentagonal one. Which makes sense for the polygones involving similar struts. However, the 3V dome base being "not regular" I couldn''t conceive this information to be true for the hexagonal connexion involving 3 different kinds of struts. (the RGB hub in the first picture from this post): http://www.geo-dome.co.uk/article.asp?uname=hub_making) Could someone tell me the real value of theses angles? Thank you very much, From Liege, Belgium, Boris Marique. PS: excuse my english I tried to be as clear as possible.

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