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
Both Sides, Now celebration for her at the Hammerstein Ballroom in New York City. The 2000 version is played during an emotional scene featuring Emma Thompson in the 2003 film "Love Actually". It was also played during the 2010 Winter Olympics opening ceremony. Mitchell's song has been recorded by many other artists over the decades. For his version, folk legend Pete Seeger added a custom fourth verse with her permission. Both Sides, Now "Both Sides, Now" is one of the best-known songs of Canadian singer-songwriter Joni Mitchell. First recorded by Judy Collins, it appeared on the U.S. singles chart during the fall of