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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...
Manual of Geometry and Conic Sections: With Applications to Trigonometry and ... - Page 19
by William Guy Peck - 1876 - 366 pages

## A Text-book of Geometry

George Albert Wentworth - Geometry, Analytic - 1889 - 266 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...

## The Elements of Plane and Solid Geometry ...

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...

## The Elements of Plane and Solid Geometry: With Numerous Exercises

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;...

## Manual of Plane Geometry, on the Heuristic Plan: With Numerous Extra ...

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,...

## Manual of Plane Geometry: On the Heuristic Plan, with Numerous Extra ...

George Irving Hopkins - 1891 - 208 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,...

## A Complete Arithmetic: With Oral and Written Exercises

George Washington Hull - Arithmetic - 1895 - 396 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...

## Plane and Solid Geometry

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...

## The Elements of Mechanical Engineering, Volume 1

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...