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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
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The Encyclopedia Americana: A Library of Universal Knowledge, Volume 22

Encyclopedias and dictionaries - 1919 - 978 pages
...sides. A polygon of three sides is termed a triangle; one of four sides, a quadrilateral or quadrangle; five sides, a pentagon; one of six sides, a hexagon; one of seven sides, a heptagon; and similarly we have octagon (8), nonagon, or more properly cnneagon (9), decagon (10), and so on....
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Solid Geometry

Charles Austin Hobbs - Geometry, Solid - 1921 - 216 pages
...indefinitely. A line joining two vertices of a polygon which arc not consecutive is called a diagonal. A polygon* of three sides is called a triangle; one of four sides, a quadrilaleral; one of five sides, a pentagon; one of six sides, a hexagon; one of eight sides, an octagon;...
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Winston's Cumulative Loose-leaf Encyclopedia: A Comprehensive ..., Volume 8

Charles Morris - Encyclopedias and dictionaries - 1921 - 528 pages
...figure of many angles and sides, or at least of more than four sides. A polygon of five sides is termed a pentagon; one of six sides, a hexagon; one of seven sides, a heptagon, and so on. Similar polygon» are those which have their several angles equal each to each, and the...
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