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 of Time Both Sides of Time Both Sides of Time (1995) is a fiction book and the first of the Time Travelers Quartet series by Caroline B. Cooney. It was first published on July 1, 1995. The hardcover book has 224 pages and was published on October 9, 2001 by Delacorte Books for Young Readers. In Both Sides of Time, Caroline B. Cooney gives a realistic view of the struggles women had faced in the 19th century and how far they have come in the 20th century. The dialogue of this novel contains a mixture of the English language from the use