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" A polygon of three sides is a triangle ; of four, a quadrilateral; of five, a pentagon ; of six, a hexagon ; of seven, a heptagon; of eight, an octagon; of nine, a nonagon; of ten, a decagon; of twelve, a dodecagon. "
First Lessons in Geometry: Upon the Model of Colburn's First Lessons in ... - Page 77
by Alpheus Crosby - 1847 - 164 pages
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The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid, James Thomson - Geometry - 1837 - 410 pages
...the number of their angles, and consequemly of their sides. Thus, a polygon of five aides is called a pentagon; of six, a hexagon ; of seven, a heptagon ; of eight, an octagon; of nine, a nonagon, or enneagon ; of ten, a decagon ; of twelve, a dodecagon; and of fifteen, a gut'ndecagon,...
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Chambers's information for the people, ed. by W. and R. Chambers, Volume 2

Chambers W. and R., ltd - 1842 - 744 pages
...; an irregular polygon has its sides or angles, or both, unequal. A polygon of five sides is called a pentagon ; of six, a hexagon ; of seven, a heptagon ; of eight, an octagon ; of nine, a nonagon ; of ten, a decagon ; of eleven, an undecagon ; of twelve, a dodecagon ; and of fifteen,...
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A Treatise on a Box of Instruments and the Slide-rule: For the Use of ...

Thomas Kentish - Geometrical drawing - 1852 - 272 pages
...equal, it is a regular polygon ; if unequal, an irregular polygon. A polygon of five sides is termed a pentagon ; of six, a hexagon ; of seven, a heptagon ; of eight, an octagon ; of nine, a nonagon ; of ten, a decagon ; of eleven, an undecagon ; and of twelve, a dodecagon. A triangle...
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Elements of Geometry, and Plane and Spherical Trigonometry: With Numerous ...

Horatio Nelson Robinson - Geometry - 1860 - 468 pages
...oblique. I— than four are denominated only by the number of sides. A polygon of five sides is called a Pentagon ; of six, a Hexagon; of seven, a Heptagon; of eight, an Octagon ; of nine, a Nonagon, etc. 41. Diagonals of a polygon are lines joining the vertices of angles not ad-*...
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Euclid's Elements of plane geometry [book 1-6] explicitly enunciated, by J ...

Euclides - 1860 - 288 pages
...regular angles. polygon has all its sides equal, and also all its 9. A polygon of five sides is called a pentagon; of six, a hexagon; of seven, a heptagon; of eight, an octagon; of nine, a nonagon ; of ten, a decagon ; of eleven, an undecagon ; of twelve, a dodecagon ; and of fifteen,...
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The gauger's guide and measurer's manual

Thomas Kentish (of London.) - 1861 - 372 pages
...compute the area of each separately. A polygon of three sides is called a trigon ; of four, a tetragon ; of five, a pentagon ; of six, a hexagon ; of seven, a heptagon ; of eight, an octagon ; of nine, a nonagon ; of ten, a decagon ; of eleven, an undecagon ; of twelve, a dodecagon ; and of sixteen,...
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Euclid's Elements of geometry, books i. ii. iii. iv

Euclides - 1862 - 140 pages
...the extremities of it are in the circumference of the circle. 9. A polygon of five sides is called a pentagon; of six, a hexagon; of seven, a heptagon; of eight, an octagon; of nine, a nonagon; of ten, a decagon; of eleven, an undecagon; of twelve, a dodecagon; and of fifteen,...
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Elements of Geometry, Plane and Spherical: With Numerous Practical Problems

Horatio Nelson Robinson - Geometry - 1868 - 276 pages
...oblique. L. than four are denominated only by the number of sides. A polygon of five sides is called a Pentagon; of six, a Hexagon • of seven, a Heptagon; of eight, an Octcujon / of nine, a Nonagon, etc. 41. Diagonals of a polygon are lines joining the vertices of angles...
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A Treatise on Special Or Elementary Geometry, Volumes 1-2

Edward Olney - Geometry - 1872 - 562 pages
...frequently made. 116. A polygpn of three sides is a triangle; of four, a quadrilateral; of five, & pentagon ; of six, a hexagon ; of seven, a heptagon ; of eight, an octagon; of nine, a nonagon; of ten, a decagon; of twelve, a dodecagon. A Regular Polygon is a polygon whose sides...
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A Treatise on Special Or Elementary Geometry

Edward Olney - Geometry - 1872 - 472 pages
...made. 1 16. A polygon of three sides is a triangle ; of four, a quadrilateral; of five, & petit ag on ; of six, a hexagon ; of seven, a heptagon ; of eight, an octagon; of nine, a nonagon; of ten, a decagon; of twelve, a dodecagon. Н7. A Regular Polygon is a polygon whose...
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