 | William Grier - Mechanical engineering - 1842 - 320 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... | |
 | William Pease - Geometry - 1843 - 80 pages
...straight lines is a polygon. A Trigon has three sides ; a Tetragon, four sides ; a Pentagon, five ; a Hexagon, six ; a Heptagon, seven]; an Octagon, eight...Decagon, ten ; an Undecagon, eleven ; and a Dodecagon, or Duodecagon, twelve sides. Others are named according to the number of their sides ; as polygons... | |
 | Charles Haynes Haswell - Engineering - 1844 - 298 pages
...of their sides or angles. Thus : A Pentagon has five sides. A Hexagon " six " A Heptagon " seven u An Octagon " eight " A Nonagon . " nine *• A Decagon " ten " An Undecagon " eleven " A Dodecagon " twelve " A CIRCLE is a plane figure bounded by a curve line, called the Circumference... | |
 | John Thomas Crossley - 1845 - 336 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... | |
 | Robert Griffith Hatfield - Architecture - 1845 - 326 pages
...(Fig. 17 ;) a hexagon six, (Pig. 18 ;) a heptagon seven, (Fig. 19 ;) an octagon eight, (Fi£-. 20 ;) a nonagon nine ; a decagon .ten ; an undecagon eleven ; and a dodecagon twelve sides. Fig. 17. Fig. 18. Fig. 19. Fig. 20. 47.— A circle is a figure bounded by a curved line, called the... | |
 | Peter Nicholson - Geometry - 1845 - 430 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... | |
 | W. PEASE - 1846 - 86 pages
...straight lines is a polygon. A Trigon has three sides ; a Tetragon, four sides ; a Pentagon, five ; a Hexagon, six ; a Heptagon, seven ; an Octagon, eight ; a Nonagon, nine ; a Decagon, ten ; an TJndecagon, eleven ; and a Dodecagon, or Duodecagon, twelve sides. Others are named according to the... | |
 | James Robinson (of Boston.) - 1847 - 304 pages
...to the number of their sides. 32. A PENTAGON is a polygon of five sides ; a Hexagon, of six sides ; a Heptagon, seven ; an Octagon, eight ; a Nonagon, nine ; a Decagon, ten ; an Undecagon, eleven ; a Dodecagon, twelve sides. 33. A REGULAR POLYGON has all its sides and angles equal. If they are... | |
 | Henry Pickton - Geometrical drawing - 1847 - 84 pages
...five, six, seven, or more sides. 3. A pentagon is a figure of five sides ; a hexagon has six sides ; a heptagon seven ; an octagon eight ; a nonagon nine ; a decagon ten ; an undecagon eleven ; a duodecagon twelve sides. 4. Polygons are called regular when their sides are all equal ; irregular,... | |
 | Seba Smith - Geometry - 1850 - 214 pages
...by names expressive of the number of their sides or angles. A pentagon has five sides, a hexagon has six, a heptagon seven, an octagon eight, a nonagon nine, a decagon ten, an undecagon eleven, a dodecagon twelve, &c. 69. A cylinder is a regular round solid, having a plane circle for its base,... | |
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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. 
