Octadecagon and 2{9/4} or two enneagrams, {18/6} is reduced to 6{3} or 6 equilateral triangles, and finally {18/9} is reduced to 9{2} as nine digons. Deeper truncations of the regular enneagon and enneagrams can produce isogonal (vertex-transitive) intermediate octadecagram forms with equally spaced vertices and two edge lengths. Other truncations form double coverings: t{9/8}={18/8}=2{9/4}, t{9/4}={18/4}=2{9/2}, t{9/2}={18/2}=2{9}. The regular octadecagon is the Petrie polygon for a number of higher-dimensional polytopes, shown in these skew orthogonal projections from Coxeter planes: Octadecagon An octadecagon (or octakaidecagon) or 18-gon is an eighteen-sided polygon. A "regular octadecagon" has a Schläfli symbol {18} and can be constructed
How to be an Alien his knowledge of English society but an insight into the English language. It is in two parts. The first part, "How to be a General Alien", deals with such important English topics as the weather, tea, how not to be clever (since it is considered bad manners), how to compromise, and queueing (according to Mikes, the national passion). The chapter entitled "Sex" is in its entirety as follows. "Continental people have sex lives: the English have hot water bottles." The second part, "How to be a Particular Alien", describes particular occupations from Bloomsbury intellectual to bus driver, finishing with how