 | William A. Morrison - Steam engineering - 1887 - 224 pages
...sides. A Regular Polygon has all its sides equal. An Irregular Polygon has not all its sides equal. A Pentagon has five sides ; a hexagon, six ; a heptagon, seven ; an octaffon, eight; a nonagon, nine; a decagon, ten; an undecagon, eleven; a dodecagon, twelve. A Perimeter... | |
 | Thomas Baker - Railroads - 1891 - 262 pages
...have more than four sides, and veceive particular names, according to the number of their sides. Thus, a pentagon has five sides; a hexagon, six; a, heptagon, seven; an octagon, eight ; &c. They are called regular polygons, when all their sides and angles are equal, otherwise irregular... | |
 | William Chauvenet - 1893 - 340 pages
...of their sides: A triangle is a polygon of three sides. A quadrilateral is a polygon of four sides. A pentagon has five sides; a hexagon, six; a heptagon, seven; an octagon, eight; an enneagon, nine; a decagon, ten; a dodecagon, twelve; etc. An equilateral polygon is one all of whose... | |
 | William A. Morrison - Steam engineering - 1895 - 204 pages
...four sides. A Begular Polygon has all its sides equal. A Pentagon has five sides ; a hexagon, six ; u heptagon, seven; an octagon, eight ; a nonagon, nine ; a decagon, ten ; an undecagon, eleven ; a dodecagon, twelve. A Perimeter of a figure is its bounds, limits, or outline. It is to other figures... | |
 | Robert Griffith Hatfield - Architecture - 1895 - 774 pages
...340); a hexagon six (Fig. 341); a heptagon seven (Fig. 342) ; an octagon eight (Fig. 343) ; a no n agon nine ; a decagon ten ; an undecagon eleven ; and a dodecagon twelve sides. Fir.. 340. FIG. 341. FIG. 342. FIG. 343. A circle is a figure bounded by a curved line, called the... | |
 | Samuel Wesley Baird - Arithmetic - 1901 - 172 pages
...shown in the accompanying figure at the right. Polygons are named according to the number of sides. A pentagon has five sides; a hexagon, six; a heptagon, seven; an octagon, eight. 1. What is a polygon ? An equilateral polygon ? An equiangular polygon ? A regular polygon ? 2. How... | |
 | Frederick Thomas Hodgson - Building - 1913 - 332 pages
...named from their number of sides or angles. Thus, a regular polygon has all its sides and angles equal. A pentagon has five sides A hexagon ' six A heptagon...nonagon " nine A decagon " ten An undecagon " eleven A dodecagon " twelve III. A figure of three sides and angles is called a triangle, and receives particular... | |
 | Frederick Thomas Hodgson - 1917 - 696 pages
...from their number of sides or angles. Thus, a regular polygon has all its sides ana angles equal. 37 A pentagon has five sides A hexagon six A heptagon...nonagon ' nine A decagon ' ten An undecagon ' eleven A dodecagon ' twelve III. A figure of three sides and angles is called a triangle, and receives particular... | |
 | Adam Hammond - Bricklaying - 1924 - 152 pages
...particular names from the number of their sides ; thus a pentagon has five sides, a hexagon has six sides, a heptagon seven, an octagon eight, a nonagon nine,...decagon ten, an undecagon eleven, and a dodecagon has twelve sides. If all the sides of each figure are equal, it is called a regular polygon ; but if... | |
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Hexagon, of six sides; a Heptagon, seven; an Octagon, eight; a Nonagon, nine ; a Decagon, ten ; an Undecagon, eleven ; and a Dodecagon, twelve sides. 
