 | George Albert Wentworth - Geometry, Analytic - 1889 - 264 pages
...called a trigon or triangle; one of four sides, a tetragon or quadrilateral ; one of five sides, & pentagon; one of six sides, a hexagon; one of seven...sides, a heptagon; one of eight sides, an octagon; one of ten sides, a decagon ; one of twelve sides, a dodecagon, PLANE GEOMETRY. — BOOK I. PROPOSITION... | |
 | Edward Albert Bowser - Geometry - 1890 - 418 pages
...AD. 139. Polygons are named from the number of their sides, as follows : A polygon of three sides is_ a triangle; one of four sides, a quadrilateral; one...sides, a heptagon; one of eight sides, an octagon; one of nine sides, a nonagon; one of ten sides, a decagon; one of twelve sides, a dodecagon; one of... | |
 | Edward Albert Bowser - Geometry - 1891 - 424 pages
...139. Polygons are named from the number of their sides, as •follows: A polygon of three sides is a triangle; one of four sides, a quadrilateral; one...one of six sides, a hexagon; one of seven sides, a hcptagon; one of eight sides, an octagon; one of nine sides, a nonagon; one of ten sides, a decagon;... | |
 | George Irving Hopkins - Geometry, Plane - 1891 - 204 pages
...four sides is usually termed what ? It is also called a tetragon. 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, one of nine sides a nonagon or enneagon, one of ten sides a decagon, one of eleven sides an undecagon,... | |
 | George Irving Hopkins - 1891 - 210 pages
...four sides is usually termed what ? It is also called a tetragon. A polygon of five sides is called a pentagon, one of six sides a hexagon, one of seven sides a heptagon, on e of eight sides an octagon, one of nine sides a nonagon or enneagon, one of ten sides a decagon,... | |
 | George Washington Hull - Arithmetic - 1895 - 408 pages
...curved. A Polygon is a plane figure bounded by straight lines. Triangle. BD Quadrilateral. Pentagon. 241. A Polygon of three sides is called a Triangle ; one...five sides, a Pentagon; one of six sides, a Hexagon, etc. The lines AB, BC, CA; DE, EF, FG, GD; and HI, IJ, JK, KL, LH, of the above polygons are called... | |
 | Wooster Woodruff Beman, David Eugene Smith - Geometry - 1895 - 346 pages
...equiangular to the other, when the angles of the one are respectively equal to the angles of the other. A polygon of three sides is called a triangle ; one of four sides, a quadrilateral. Other special kinds of polygons are mentioned after th. 20. Any side of a polygon may be called its... | |
 | International Correspondence Schools - Electrical engineering - 1897 - 672 pages
...AB CD EA is the perimeter. 698. Polygons are classified according to the number of their sides: One of three. sides is called a triangle ; one of four...sides, a heptagon ; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve sides, a dodecagon, etc. 699. Equilateral polygons are... | |
 | International Correspondence Schools - Surveying - 1898 - 518 pages
...is the perimeter. FIG. 21. 33. Polygons are classified according to the number of their sides: One of three sides is called a triangle; one of four sides,...sides, a heptagon ; one of eight sides, an octagon; one of ten sides, a decagon ; one of twelve sides, a dodecagon ; etc. FIo. 34. Equilateral polygons... | |
 | George Albert Wentworth - Geometry - 1899 - 498 pages
...mutually equilateral and mutually equiangular, they are equal, for they can be made to coincide. 204. A polygon of three sides is called a triangle ; one...sides, a heptagon ; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve sides, a dodecagon. PROPOSITION XXXIX. THEOREM. 205.... | |
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A Polygon of three sides is called a triangle ; one of four sides, a quadrilateral; one of five sides, a pentagon; one of six sides, a hexagon; one of seven sides, a heptagon; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve... 
