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 Have Sex in an Epidemic B, were already at "endemic" levels. Sonnabend writes about condoms at the time: "I think most gay men said, 'Oh thank god, that's one thing we don't have to worry about,'" and many didn't know how to use one. However, as Callen, Berkowitz and Sonnabend would show them, condoms really were something to worry about and could be an easy way to prevent disease and death while continuing to have a normal and fulfilling sex life. Along with "Play Fair!", its San Francisco counterpart written by a drag group called the Sisters of Perpetual Indulgence, "How to Have Sex in