 Polygons are those which have more than four sides. They receive 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, a decagon ten, an undecagon...  First book of mathematics - Page 112by Hugo Reid - 1872 - 124 pagesFull view - About this book
 | Ireland commissioners of nat. educ - 1834 - 370 pages
...which have raore than four sides. They receive particular 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,... | |
 | Luke Hebert - Industrial arts - 1835 - 816 pages
...three sides is called a triangle, and a figure of four sides, a quadrangle. A pentagon is a polygon of five sides. A hexagon has six sides. A heptagon has seven sides. An octagon has eight sides. А попagет, nine sides. A decagon, ten sides. An undecagon, eleven sides. A duodecagon, twelve... | |
 | Luke Hebert - Industrial arts - 1836 - 814 pages
...three sides is called a triangle. and a figure of four sides, a quadrangle. A pentagon is a polygon of five sides. A hexagon has six sides. A heptagon has...seven sides. An octagon has eight sides. A nonagon, nine sides. A decagon, ten sides. An undecagon, eleven sides. A duodecagon, twelve sides. When they... | |
 | Commissioners of National Education in Ireland - Measurement - 1837 - 290 pages
...which have more than four sides. They receive 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 ; a Decagon, ten ; an Undecagon, eleven ; and a Dodecagon... | |
 | Ellis A. Davidson - 1869 - 136 pages
...; and therefore, each one of them has a name by which you can tell how many sides it has ; thus — A PENTAGON has FIVE sides. A HEXAGON has SIX sides....A NONAGON has NINE sides. A DECAGON has TEN sides. F A figure having five sides is called a PENTAGON (which means five angles). TO DEAW A PENTAGON, of... | |
 | Adam Hammond - Bricklaying - 1885 - 184 pages
...which have more than four sides. They receive 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, a decagon ten, an undecagon eleven, and a dodecagon has twelve... | |
 | Samuel Wesley Baird - Arithmetic - 1901 - 168 pages
...of division of the arcs by straight lines (chords) as shown in the accompanying figure at the right. Polygons are named according to the number of sides. A pentagon has five sides; a hexagon, six; a heptagon, seven; an octagon, eight. 1. What is a polygon ? An equilateral polygon ? An equiangular... | |
 | Robert Wahl, Max Henius - Brewing - 1902 - 1288 pages
...with right angles is called a "rectangle." A rectangle whose sides are all equal is called a "square." A "pentagon" has five sides. A "hexagon" has six sides...."heptagon" has seven sides. An "octagon" has eight sides. Fig. 22 — Trapezoid. Fig. 23— Trapezium. Fig. 24— Rectangle. The "perimeter" is the boundary... | |
 | Joseph Harrison (A.M.I.C.E.) - Geometry - 1903 - 300 pages
...sides. The number of sides may be three or upwards. A triangle has three sides. A quadrilateral has four sides. A pentagon has five sides. A hexagon has six...heptagon has seven sides. An octagon has eight sides. In what follows, unless otherwise stated, by polygon is to be understood a convex polygon, all the... | |
 | A. Herring-Shaw - 1910 - 288 pages
...Nonagon has nine sides. A Decagon has ten sides. An Undecagon has eleven sides. A Duodecagon has twelve sides. A Pentagon has five sides. A Hexagon has six...Heptagon has seven sides. An Octagon has eight sides. CHAPTER II PROBLEMS OF TRIANGLES, CIRCLE, QUADRILATERALS, ETC. LINES AND ANGLES Problem 1. — To bisect... | |
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