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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 Modern Preceptor Or a General Course of Education: Containing ..., Volume 1

John Dougall - 1810 - 554 pages
...distinguished by various names, descriptive of their number of sides* thus, one of five sides is called a. pentagon; one of six sides, a hexagon ; one of...sides, a heptagon ; one of eight sides, an octagon ; one of nine sides, a notiagon ; one of ten sides, a decagon ; one of twelve sides, a dodecagon ;...
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The Young Man's Best Companion and Guide to Useful Knowledge

John Dougall - Encyclopedias and dictionaries - 1815 - 516 pages
...which are always of the same number with the sides ; thus a figure of five sides or angles, is called a pentagon, one of six sides a hexagon, one of seven sides a heptagon, one of eight sides an octagon, one of nine sides an enneagon, or more commonly by a Latin term, a nonagon, one often sides ttdecagon,...
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A treatise on navigation, and nautical astronomy

Edward Riddle - Nautical astronomy - 1824 - 572 pages
...than four sides receive the general denomination of Polygons. 39. A Polygon of five sides is called a Pentagon ; one of six sides, a Hexagon ; one of...sides a Heptagon ; one of eight sides an Octagon, &c. 40. A Regular Polygon is one which has all its sides equal, and abo all its angles equal. \ 41....
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The Measure of the Circle: Perfected in January, 1845

John Davis - Circle-squaring - 1854 - 172 pages
...letters, the name of a polygon. Thus, one of three sides is a trigon ; one of four sides a tetragon ; one of five sides a pentagon ; one of six sides a...seven sides a heptagon ; one of eight sides an octagon ; one of nine sides a nonagon-; one of ten sides a decagon; one of eleven sides an endecagon; one of...
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The Measure of the Circle: Perfected in January, 1845

John Davis (of Providence, R. I.) - Circle-squaring - 1854 - 170 pages
...three sides is a trigon; one of four sides a tetragon ; one of five sides a pentagon ; one of «ix sides a hexagon ; one of seven sides a heptagon ; one of eight sides an octagon ; one of nine sides a nonagon ; one of ten sides a decagon; one of eleven sides an endecagon; one of...
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Carpentry Made Easy: Or, The Science and Art of Framing, on a New and ...

William E. Bell - Bridge building - 1857 - 254 pages
...which is both equilateral and equiangular. 21. The polygon of three sides is called a triangle; that of four sides, a quadrilateral; one of five sides, a pentagon; one of sir, a hexagon; one of seven, a heptagon ; one of eight, an octagon ; one of nine, a nonagon ; one...
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Carpentry Made Easy, Or, The Science and Art of Framing, on a New and ...

William E. Bell - Bridges - 1859 - 224 pages
...which is both equilateral and equiangular. 21. The polygon of three sides is called a triangle ; that of four sides, a quadrilateral ; one of five sides, a pentagon ; one of six, a hexagon; one of seven, a heptagon; one of eight, an octagon; one of nine, a nonagon; one of ten,...
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Elements of Plane and Spherical Trigonometry: With Practical Applications

Benjamin Greenleaf - Geometry - 1862 - 514 pages
...space they enclose is called a RECTILINEAL FIGURE, or POLYGON ; as the figure А В С D E. А в 21. 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,...
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Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1863 - 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...
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Elements of Geometry: With Practical Applications to Mensuration

Benjamin Greenleaf - Geometry - 1866 - 328 pages
...straight, the space they enclose is called a RECTILINEAL FIGURE, or POLYGON ; as the figure ABODE. AB 21. 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,...
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