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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... "
Elements of Geometry: And the First Principles of Modern Geometry - Page 14
by William Henry Harrison Phillips - 1878 - 209 pages
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A Textbook on Surveying and Mapping ...: Arithmetic, formulas, geometry and ...

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,...heptagon ; one of eight sides, an octagon; one of ten sides, a decagon ; one of twelve sides, a dodecagon ; etc. FIo. 34. Equilateral polygons are FIG....
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Plane and Solid Geometry

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...heptagon ; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve sides, a dodecagon. PROPOSITION XXXIX. THEOREM. 205. The sum of...
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Plane Geometry

George Albert Wentworth - Geometry, Modern - 1899 - 272 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...heptagon ; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve sides, a dodecacion. BOOK I. PLANE GEOMETRY. PROPOSITION XXXIX....
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Arithmetic, algebra, logarithms, geometry and trigonometry, elementary ...

International Correspondence Schools - Civil engineering - 1899 - 722 pages
...line ABCD EA is the perimeter. 33. Polygons are classified according to the number of their sides: One of three sides is called a triangle; one of four sides,...heptagon ; one of eight sides, an octagon ; one of ten sides, a decagon; one of twelve sides, a dodecagon ; etc. 34. Equilateral polygons are those in...
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The Elements of Plane Geometry

Charles Austin Hobbs - Geometry, Plane - 1899 - 266 pages
...coincide. A polygon of three sides is called a trigon or triangle; one of four sides, a tetragon or quadrilateral; one of five sides, a pentagon; one...a heptagon; one of eight sides, an octagon; one of ten sides, a decagon; one of twelve sides, a dodecagon, and so on. In general, the names of the polygons...
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Plane Geometry

George Albert Wentworth - Geometry, Modern - 1899 - 272 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...of four sides, a quadrilateral; one of five sides, & pentagon; one of six sides, a hexagon ; one of seven sides, a heptagon ; one of eight sides, an octagon...
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New Plane and Solid Geometry

Wooster Woodruff Beman, David Eugene Smith - Geometry - 1899 - 416 pages
...to the other, when the angles of the one are respectively equal to the angles of the other. / 7 55. A polygon of three sides is called a triangle ; one of four sides, a quadrilateral. 56. Any side of a polygon may be called its base, the side on which the figure appears to stand being...
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Plane and Solid Geometry

George Albert Wentworth - Geometry - 1899 - 500 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 of four sides, a.quadrilateral; one of five sides, a pentagon ; one of six sides, a hexagon ; one of seven sides,...
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Plane Geometry

William James Milne - Geometry, Modern - 1899 - 258 pages
...sides. 162. A polygon of three sides is called a trigon or triangle ; one of four sides, a tetragon or quadrilateral ; one of five sides, a pentagon ; one of six sides, a hexagon ; on3 of seven sides, a heptagon ; one of eight sides, an octagon ; one of ten sides, a decagon; one...
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A Textbook on Mining Engineering, Volume 1

1900 - 744 pages
...line ABCDEA 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...heptagon ; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve sides, a dodecagon, etc. 699. Equilateral polygons are those in...
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