 A 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 ; of nine sides a Nonagon ; of ten sides a Decagon ; of twelve sides...  Graded Work in Arithmetic - Page 293by Samuel Wesley Baird - 1901Full view - About this book
 | Alexander Ingram - Mathematics - 1830 - 458 pages
...by more than four straight lines, as ABODE. 39. A POLYGON of five sides is called a Pentagon ; one of six sides, a Hexagon ; of seven sides, a Heptagon; of eight sides, an Octagon; of nine sides, a Nonagon ; of ten sides, a Decagon, &c. I PROBLEMS. PEOB. I. To draw a straight line... | |
 | Education - 1835 - 496 pages
...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, of eight sides an octagon, of nine sides a nonagon, of ten sides a decagon, of eleven sides an uudecagon, and of twelve sides... | |
 | Thomas Rainey - Arithmetic - 1849 - 334 pages
...sides, is called a polygon.^ The lowest polygon, that of three sides, is called a triangle ;J that of four sides, a quadrilateral; of five sides, a pentagon...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... | |
 | Alexander Ingram - 1851 - 202 pages
...B more than four straight lines, as ABODE. D 39. A POLYGON of five sides is called a Pentagon ; one of six sides, a Hexagon; of seven sides, a Heptagon; of eight sides, an Octagon; of nine sides, a Nonagon; of ten sides, a Decagon, &c. 40. A REGULAR POLYGON is that which has all... | |
 | Susanna Mary Paull - 1852 - 270 pages
...figure of four sides a quadrangle, a square, or a parallelogram. Q. What are the others ? A. A figure of five sides a pentagon, of six sides a hexagon, of seven a heptagon, of eight an octagon, of nine a nonagon, of ten a decagon, and of many sides a polygon.... | |
 | Thomas Hill - Geometry - 1855 - 152 pages
...straight lines is a polygon ; and, if its vertices are in a circumference, it is an inscribed polygon. 2. A polygon of three sides is called a triangle ; of four sides a quadrangle ; of five sides a pentagon ; of six sides a hexagon. 3. Any polygon of more than three sides... | |
 | Emerson Elbridge White - Arithmetic (Commercial), 1861 - 1861 - 348 pages
...an equivalent space. A rectilinear figure, or polygon, is a plane figure bounded by straight lines. A polygon of three sides is called a triangle, of four sides a quadrilateral, of five a pentagon, of six a hexagon, and so on. A regular polygon is one whose sides and angles arc equal.... | |
 | Evan Wilhelm Evans - Geometry - 1862 - 116 pages
...Sit. VII.— OF POLYGONS IN GENERAL. DEFINITIONS. 1. A polygon of five sides is called a PENTAGON; one of six sides, a HEXAGON ; of seven 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... | |
 | Edward Brooks - 1863 - 344 pages
...larger than a right angle ; as, DEG. ' 462. A Polygon is a figure bounded by straight lines; as, ABODE. A Polygon of three sides is called a Triangle, of four sides, a Quadrilateral, etc. D c 463. The Area of a polygon is the number of square units in its surface. THE TRIANGLE. 464.... | |
 | Euclides - 1865 - 80 pages
...particular 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... | |
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