| Encyclopedias and dictionaries - 1919 - 980 pages
...sides. A polygon of three sides is termed a triangle; one of four sides, a quadrilateral or quadrangle; **five sides, a pentagon; one of six sides, a hexagon; one of seven sides, a heptagon;** and similarly we have octagon (8), nonagon, or more properly cnneagon (9), decagon (10), and so on.... | |
| Charles Austin Hobbs - Geometry, Solid - 1921 - 216 pages
...indefinitely. A line joining two vertices of a polygon which arc not consecutive is called a diagonal. **A polygon* of three sides is called a triangle; one of four sides, a** quadrilaleral; one of five sides, a pentagon; one of six sides, a hexagon; one of eight sides, an octagon;... | |
| Charles Morris - Encyclopedias and dictionaries - 1921 - 528 pages
...figure of many angles and sides, or at least of more than four sides. A polygon of five sides is termed **a pentagon; one of six sides, a hexagon; one of seven sides, a heptagon,** and so on. Similar polygon» are those which have their several angles equal each to each, and the... | |
| |