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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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Shop Calculations ; Reading Working Drawings ; Measuring Instruments ...

Measuring instruments - 1914 - 428 pages
...AB CD EA is the perimeter. 25. 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. 26. A regular polygon is one in which...
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Plane Geometry

John Charles Stone, James Franklin Millis - Geometry - 1916 - 306 pages
...according to the number of sides. A polygon of three sides is a triangle. A polygon of four sides is called a quadrilateral ; one of five sides, a pentagon ; one of six sides, a hexagon ; one of eight sides, an octagon ; one of ten sides, a decagon ; etc. 81. Quadrilaterals. — A trapezium is...
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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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