 | John Dougall - 1810 - 734 pages
...than four sides are distinguished by various names, descriptive of their number of sides : thus, one of five sides is called a pentagon ; one of six sides,...eight sides, an octagon; one of nine sides, a nonagon; on? of ten sides, a decagon ; one of twelve sides, a dodecagon ; and so on ; but in general they are... | |
 | John Dougall - 1810 - 554 pages
...than four sides are distinguished by various names, descriptive of their number of sides* thus, one of five sides is called a. pentagon; one of six sides,...of eight sides, an octagon ; one of nine sides, a notiagon ; one of ten sides, a decagon ; one of twelve sides, a dodecagon ; and so on ; but in general... | |
 | John Dougall - Encyclopedias and dictionaries - 1815 - 514 pages
...angles, which are always of the same number with the sides ; thus a figure of five sides or angles, is called a pentagon, one of six sides a hexagon,...heptagon, one of eight sides an octagon, one of nine sides an enneagon, or more commonly by a Latin term, a nonagon, one often sides ttdecagon, one of eleven... | |
 | Edward Riddle - Nautical astronomy - 1824 - 572 pages
...quadrilateral. 38. Plane figures of more than four sides receive the general denomination of Polygons. 39. A Polygon of five sides is called a Pentagon ; one...sides a Heptagon ; one of eight sides an Octagon, &c. 40. A Regular Polygon is one which has all its sides equal, and abo all its angles equal. \ 41.... | |
 | Alexander Ingram - Mathematics - 1830 - 458 pages
...figure, as MP. 38. A POLYGON is a figure contained by more than four straight lines, as ABODE. 39. A POLYGON of five sides is called a Pentagon ; one of six sides, a Hexagon ; of seven sides, a Heptagon; of eight sides, an Octagon; of nine sides, a Nonagon ; of ten sides,... | |
 | Alexander Ingram - 1851 - 202 pages
...figure, as MP. 38. A POLYGON is a figure contained by B more than four straight lines, as ABODE. D 39. A POLYGON of five sides is called a Pentagon ; one of six sides, a Hexagon; of seven sides, a Heptagon; of eight sides, an Octagon; of nine sides, a Nonagon; of ten sides, a Decagon,... | |
 | John Davis - Circle-squaring - 1854 - 172 pages
...a polygon. Thus, one of three sides is a trigon ; one of four sides a tetragon ; one of five sides a pentagon ; one of six sides a hexagon ; one of seven...eight sides an octagon ; one of nine sides a nonagon-; one of ten sides a decagon; one of eleven sides an endecagon; one of twelves sides a dodecagon. TO... | |
 | John Davis (of Providence, R. I.) - Circle-squaring - 1854 - 170 pages
...generally called polygons ; but they receive particular names, according to their number of sides. Thus a polygon of five sides is called a pentagon ; one of six sides a hexagon ; one of nine sides a nonagon ; one of ten sides a decagon ; one of eleven sides an endecagon ; one of twelve... | |
 | George Roberts Perkins - Geometry - 1856 - 460 pages
...five sides is called a pentagon ; that of six sides is called a hexagon / one of seven sides is called a heptagon ; one of eight sides an octagon ; one of nine sides a nonagon, and so on for figures of a greater number of sides. XXI. A triangle having the three sides equal, is... | |
 | George Roberts Perkins - Geometry - 1860 - 472 pages
...five sides is called a pentagon; that of six sides is called a hexagon ; one of seven sides is called a heptagon ; one of eight sides an octagon ; one of nine sides a nonagon, and so on for figures of a greater number of sides. XXI. A triangle having the three sides equal, is... | |
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A Polygon of three sides is called a triangle ; one of four sides, a quadrilateral; one of five sides, a pentagon; one of six sides, a hexagon; one of seven sides, a heptagon; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve... 
