 | Arthur Parsey - Miniature painting - 1831 - 242 pages
...and four angles. (Plate 3, fig. 15.) A pentagon is a polygon of five sides; a hexagon hath six sides; a heptagon seven ; an octagon eight; a nonagon nine; a decagon ten, &c. &c. These various superficies are called regular when all the sides are equal, and irregular figures... | |
 | Edward Shaw - Architecture - 1832 - 402 pages
...number of their sides or angles. 39. A pentagon is a polygon of five sides, a hexagon has six sides, a heptagon seven, an octagon eight, a nonagon nine,...an undecagon eleven, and a dodecagon twelve sides. 40. A regular polygon has all its sides and angles equal ; and if they are not equal, die polygon is... | |
 | William Grier - Mechanical engineering - 1832 - 366 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, nine...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... | |
 | Peter Nicholson - Bricklaying - 1832 - 424 pages
...is a polygon of five sides, a hexagon of six sides, a heptagon seven, an octagon eight, an eneagon nine, a decagon ten, an undecagon eleven, and a dodecagon twelve sides. A regular polygon has all its sides, and its angles equal; and if they are not equal, the polygon is... | |
 | Ireland commissioners of nat. educ - 1834 - 370 pages
...names fi-om 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 ; a Decagon, ten ; an Undecayon, eleven ; and a Duodecagon, has twelve sides. If all the sides of each figure be equal, it... | |
 | Industrial arts - 1835 - 398 pages
...their sides or an. gles. 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 polygon... | |
 | William Grier - Mechanical engineering - 1836 - 384 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, nine...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... | |
 | Edward Shaw - Architecture - 1836 - 438 pages
...number of their sides or angles. 39. A pentagon is a polygon of five sides, a hexagon has six sides, a heptagon seven, an octagon eight, a nonagon nine,...an undecagon eleven, and a dodecagon twelve sides. 40. A regular polygon has all its sides and angles equal ; and if they are not equal, the polygon is... | |
 | William Grier - Mechanical engineering - 1836 - 380 pages
...is a polygon of five sides; a Hexagon of six sides; a Heptagon, seven; an Octagon, eight; a Nouagon, nine : a Decagon, ten ; an Undecagon, eleven ; and a Dodecagon, twelve sides. 42. A Begular Polygon has all its sides and all its ancles equal. — If they are not both equal, the... | |
 | Commissioners of National Education in Ireland - Measurement - 1837 - 284 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,...Decagon, ten ; an Undecagon, eleven ; and a Dodecagon has twelve sides. If all the sides of each figure be 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. 
