| John Dougall - 1810 - 580 páginas
...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, a hexagon** ; one of seven sides, a heptagon ; one of eight sides, an octagon; one of nine sides, a nonagon; on?... | |
| Edward Riddle - 1824
...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 of six sides, a Hexagon** ; one of seven sides a Heptagon ; one of eight sides an Octagon, &c. 40. A Regular Polygon is one which... | |
| 1835
...distinguished according to the number of their sides ; thus a figure of five equal sides is termed a pentagon, **of six sides a hexagon, of seven sides a heptagon,...octagon, of nine sides a nonagon, of ten sides a decagon,** of eleven sides an uudecagon, and of twelve sides a dodecagon. TO FIND THE AREA OF A POLYGON. Multiply... | |
| Thomas Rainey - 1849 - 312 páginas
...three sides, is called a triangle ;% that of four sides, a quadrilateral; of five sides, a pentagon; **of six sides, a hexagon; of seven sides, a heptagon; of eight sides, an octagon; of nine,** a nonagon ; of ten, a decagon ; of eleven, an undecagon ; and of twelve, a dodecagon. There are four... | |
| John Davis, John Davis (of Providence, R. I.) - 1854 - 156 páginas
...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... | |
| Evan Wilhelm Evans - 1862 - 98 páginas
...the perpendicular is the longest (Theo. XIX). Sit. VII.— OF POLYGONS IN GENERAL. DEFINITIONS. 1. **A polygon of five sides is called a PENTAGON; one...sides, a HEPTAGON ; of eight sides, an OCTAGON ; of** ten sides, a DECAGON ; of twelve sides, a DODECAGON. 2. A regular polygon is one which is both equilateral... | |
| 1865
...names from the number of their sides and angles ; thus a polygon of five sides is called a PENTAGON ; **of six sides, a HEXAGON ; of seven sides, a HEPTAGON ; of eight sides, an OCTAGON,** etc. 32. The ALTITUDE of a triangle or parallelogram is the perpendicular drawn from the opposite angle... | |
| Henry Bartlett Maglathlin - 1869 - 324 páginas
...polygon of three sides is called a Triangle, of four sides a Quadrilateral, of five sides a Pentagon, **of six sides a Hexagon, of seven sides a Heptagon, of eight sides an Octagon,** etc. 409. Mensuration treats of the measurement of lines, planes, and solids or volumes (Art. 199).... | |
| Hugo Reid - 1872 - 124 páginas
...ABDEFG, page 63, is a regular polygon. 193. A regular polygon of five sides is called a pentagon ; **of six sides, a hexagon ; of seven sides, a heptagon...of nine sides, a nonagon ; of ten sides, a decagon.** 194. The CENTRE of a regular polygon is a point -within, equidistant from the angular points. It is... | |
| Henry Bartlett Maglathlin - 1873 - 336 páginas
...polygon of three sides is called a Triangle, of four sides a Quadrilateral, of five sides a Pentagon, **of six sides a Hexagon, of seven sides a Heptagon, of eight sides an Octagon,** etc. 409. Mensuration treats of the measurement of lines, planes, and solids or volumes (Art. 199).... | |
| |