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" 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 a Dodecagon. "
Plane Geometry - Page 74
by Fletcher Durell - 1904 - 372 pages
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A Concise System of Mathematics ...

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 parallel...
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The Educational Magazine, Volume 2

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 a dodecagon....
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Rainey's Improved Abacus: An Explanatory Treatise on the Theory and Practice ...

Thomas Rainey - Arithmetic - 1849 - 320 pages
...The lowest polygon, that of three sides, is called a triangle ;% that of four sides, a quadrilateral; of five sides, a pentagon; of six sides, a hexagon;...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 are...
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A complete System of Mensuration ... With many ... Additions ... by J. Trotter

Alexander Ingram - 1851 - 204 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 its...
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Primary Elements of Plane and Solid Geometry: For Schools and Academies

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...ten sides, a DECAGON ; of twelve sides, a DODECAGON. 2. A regular polygon is one which is both equilateral and equiangular. Squares and equilateral triangles...
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Elements of plane geometry, book i, containing nearly the same propositions ...

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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New Practical Arithmetic in which the Science and Its Applications are ...

Henry Bartlett Maglathlin - Arithmetic - 1869 - 332 pages
...sides and equal angles. A polygon of three sides is called a Triangle, of four sides a Quadrilateral, of five sides a Pentagon, of six sides a Hexagon,...seven sides a Heptagon, of eight sides an Octagon, etc. 409. Mensuration treats of the measurement of lines, planes, and solids or volumes (Art. 199)....
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First book of mathematics

Hugo Reid - Mathematics - 1872 - 146 pages
...rectilineal figure ABDEFG, page 63, is a regular polygon. 193. A regular polygon of five sides is called 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. 194. The CENTRE of a regular polygon is a point -within,...
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New Practical Arithmetic: In which the Science and Its Applications are ...

Henry Bartlett Maglathlin - Arithmetic - 1873 - 362 pages
...sides and equal angles. A polygon of three sides is called a Triangle, of four sides a Quadrilateral, of five sides a Pentagon, of six sides a Hexagon,...seven sides a Heptagon, of eight sides an Octagon, etc. 409. Mensuration treats of the measurement of lines, planes, and solids or volumes (Art. 199)....
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A Geometry for Beginners

George Anthony Hill - Geometry - 1880 - 348 pages
...the term chiefly to those figures which have more than four sides. A polygon of five sides is called 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 a DODECAGON, of twenty sides an ICOSAGON....
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