Octadecagon 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 as a quasiregular truncated enneagon, t{9}, which alternates two types of edges. As 18 = 2 × 3, a regular octadecagon cannot be constructed using a compass and straightedge. However, it is constructible using neusis, or an angle trisection with a tomahawk. The following approximate construction is very similar to that of the enneagon, as an octadecagon can be constructed as a truncated enneagon. It is also feasible with exclusive use of compass and straightedge. The "regular
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