 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.  Elements of Plane Geometry - Page 55by Franklin Ibach - 1882 - 196 pagesFull view - About this book
 | 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, or pentedecagon.... | |
 | Abraham Crocker - 1841 - 486 pages
...according to the number of their sides : thus, a figure of five sides is called a pentagon ; of six sides - 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, &c. If the sides and angles of any such polygon be... | |
 | 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...octagon ; of nine, a nonagon ; of ten, a decagon ; of eleven, an undecagon ; of twelve, a dodecagon ; and of fifteen, a qutndtcagon or jn-nu-iltcagon. Figures... | |
 | Alpheus Crosby - Geometry - 1847 - 192 pages
...its SIDES ; and the sum of these lines, its PERIMETER"". § 37. A polygon of three sides is termed a TRIANGLE'; of four, a QUADRILATERAL'; of five, a...of seven, a HEPTAGON" ; of eight, an OCTAGON" ; of ten, a DECAGON" ; &c. § 38. The sides and angles of a polygon are termed its PARTS ; and those which... | |
 | Alpheus Crosby - Geometry - 1847 - 190 pages
...and the sum of these lines, its PERIMETER"". § 37. A polygon of three sides is termed a TRIANGLE>1 ; of four, a QUADRILATERAL'; of five, a PENTAGON'; of...of seven, a HEPTAGON" ; of eight, an OCTAGON" ; of ten, a DECAGON" ; &c. § 38. The sides and angles of a polygon are termed its PARTS ; and those which... | |
 | Alpheus Crosby - Geometry - 1847 - 190 pages
...PERIMETERP. § 37. A polygon of three sides is termed a TRIANGLE11 ; of four, a QUADRILATERAL'; of Jive, a PENTAGON'; of six, a HEXAGON' ; of seven, a HEPTAGON" ; of eight, an OCTAGON' ; of ten, a DECAGON" ; &c. § 38. The sides and angles of a polygon are termed its PARTS ; and those which... | |
 | 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...octagon ; of nine, a nonagon ; of ten, a decagon ; of eleven, an undecagon ; and of twelve, a dodecagon. A triangle is sometimes called a trigon ; and a... | |
 | Thomas Kentish - Geometrical drawing - 1852 - 258 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...an octagon ; of nine, a nonagon ; of ten, a decagon j of eleven, an undecagon ; and of twelve, a dodecagon. A triangle is sometimes called a trigon ] and... | |
 | Susanna Mary Paull - 1852 - 270 pages
...square, or a parallelogram. Q. What are the others ? A. A figure of five sides a pentagon, of six sides a hexagon, of seven a heptagon, of eight an octagon, of nine a nonagon, of ten a decagon, and of many sides a polygon. Q. What are angles ? A. Corners formed by the meetings of two lines ;... | |
 | 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;...octagon; of nine, a nonagon ; of ten, a decagon ; of eleven, an undecagon ; of twelve, a dodecagon ; and of fifteen, a guindecagon or pentedecagon. 10.... | |
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