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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

## Elements of Geometry and Trigonometry from the Works of A.M. Legendre ...

Charles Davies - Geometry - 1872 - 464 pages
...called angles of the polygon. 19. Polygons are classified according to the number of their sides or angles. A Polygon of three sides is called a triangle/...sides, a heptagon / one of eight sides, an octagon; one of ten sides, a decagon ; one of twelve sides, a dodecagon, &c. 20. An EQUILATERAL POLYGON, is...

## New Elementary Geometry: With Practical Applications ; a Shorter Course Upon ...

Benjamin Greenleaf - Geometry - 1873 - 202 pages
...curves. ELEMENTARY GEOMETKY. 17. A Polygon is a plane bounded by straight lines ; as the figure ABCDE. A polygon of three sides is called a triangle; one of four sides, a quadrilateral; one of five, & pentagon; one of six, a hexagon; one of seven, a heptagon; one of eight, an octagon; one of nine,...

## Elements of Geometry and Trigonometry: From the Works of A.M. Legendre

Adrien Marie Legendre - Geometry - 1874 - 512 pages
...called angles of the polygon. 19. Polygons are classified according to the number of their sides or angles. A Polygon of three sides is called a triangle...sides, a heptagon ; one of eight sides, an octagon / one of ten sides, a decagon / one of twelve sides; a dodecagon, &o. , 20. An EQUILATERAL POLYGON,...

## Elements Of Geometry And Trigonometry

Charles Davies - 1874 - 464 pages
...according to the number of their sides or angles. A Polygon of three sides is called a tri>n1gls ; one of four sides, a quadrilateral ; one of five sides,...sides, a heptagon / one of eight sides, an octagon / one of ten sides, a decagon ; one of twelve sides, a dodecagon, &c. 20. An EQUILATERAL POLYGON, is...

## A Practical Business Arithmetic ...

Lorenzo Fairbanks - 1875 - 468 pages
...Rectilinear Figure, or Polygon. A Polygon having only three sides is called a Triangle ; one having four sides, a Quadrilateral ; one of five sides, a...sides, a Heptagon , one of eight sides, an Octagon ; one of nine sides, a Nonagon ; one of ten sides, a Decagon, etc. 702. A Bight-angled Triangle is...

## New Elementary Geometry, with Practical Applications

Benjamin Greenleaf - Geometry - 1875 - 204 pages
...straight lines or curves. *17. A Polygon is a plane bounded by straight lines; as the figure ABCDE. A polygon of three sides is called a triangle; one of four sides, a quadrilateral; one of five, a pentagon; one of six, a hexagon; one of seven, a heptagon; one of eight, an octagon; one of nine,...

## Euclid simplified. Compiled from the most important French works, approved ...

John Reynell Morell - 1875 - 220 pages
...of the figure. A polygon which has only three sides is a triangle. A polygon of four sides is named a quadrilateral ; one of five sides, a pentagon ; one of six sides, a hexagon, &c. A polygon is convex when it is all on the same side of each of the straight lines that bound it...

## Elements of Geometry and the First Principles of Modern Geometry

Wm. H. H. Phillips - Geometry - 1878 - 236 pages
...polygon. DEC. 2. A diagonal is a line joining the vertices of two angles not consecutive ; as, AC. DEF. 3. A polygon of three sides is called a triangle; one...sides, a heptagon; one of eight sides, an octagon; one of nine sides, an enneagon; one of ten sides, a decagon; one of twelve sides, a dodecagon; &c....