 | William Grier - Mechanical engineering - 1861 - 316 pages
...of their sides or angles. Thus, 41. A Pentagon is a polygon of five sides ; a Hexagon of six sides; a Heptagon, seven; an Octagon, eight ;^a Nonagon,...Undecagon, eleven ; and a Dodecagon, twelve sides. 42. A Regular Polygon has all its sides and all its angles equal. — If they are not both equal, the... | |
 | Great Britain. Committee on Education - Education - 1864 - 332 pages
...number of their sides or angles. Thus, A Pentagon is a polygon of five sides; a Hexagon, of six sides; a Heptagon, seven ; an Octagon, eight ; a Nonagon,...Undecagon, eleven ; and a Dodecagon, twelve sides. A Regular Polygon has all its sides and all its angles equal. — If they are not equal, the polygon... | |
 | Thomas Baker (C.E.) - 1865 - 174 pages
...have more than four sides, and receive 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 regular polygons, when all their sides and angles are equal, otherwise irregular polygons.... | |
 | Gerardus Beekman Docharty - Geometry - 1867 - 474 pages
...of their sides or angles. Thus, 41. A Pentagon is a polygon of five sides; a Hexagon, of six sides ; a Heptagon, seven ; an Octagon, eight ; a Nonagon,...Undecagon, eleven ; and a Dodecagon, twelve sides. ^ 42. A Regular Polygon has all its sides and all its angles equal. If they are not both equal, the... | |
 | William Chauvenet - Geometry - 1871 - 380 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 Chauvenet - Mathematics - 1872 - 382 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... | |
 | John Carroll (art master.) - Geometry - 1881 - 100 pages
...Polygon. A Pentagon has five sides, Fig. 19 ; a Hexagon six, Fig. 20 ; a Heptagon seven, Fig. 21 ; an Octagon eight ; a Nonagon nine ; a Decagon ten ; an Undecagon eleven ; a Dodecagon twelve. THE CIRCLE AND ITS PARTS. A Circle is a plane figure bounded by one curve called... | |
 | Frederick Thomas Hodgson - Carpentry - 1883 - 174 pages
...polygon of six sides, as L, Fig. 13. 35. An Octagon has eight sides, as N, Fig. 15. An Enneagon has nine, a Decagon ten, an Undecagon eleven, and a Dodecagon twelve sides. Figures having more than twelve sides are generally designated Polygons, or many-angled figures. 36.... | |
 | Adam Hammond - Bricklaying - 1885 - 184 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... | |
 | William Chauvenet, William Elwood Byerly - Geometry - 1887 - 331 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... | |
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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. 
