 | John Weale - Architecture - 1850 - 600 pages
...is a polygon of five sides, a hexagon of six sides, a heptagon seven, an octagon eight, an enueagon nine, a decagon ten, an undecagon eleven, and a dodecagon twelve sides. A regular polygon has all its sides and its angles equal ; and if they are not equal, the polygon is... | |
 | John Weale - 1850 - 590 pages
...is a polygon of five sides, a hexagon of six sides, a heptagon seven, an octagon eight, an enneagon nine, a decagon ten, an undecagon eleven, and a dodecagon twelve sides. An equilateral triangle is also a regular figure of three sides, and a square is one of four; the former... | |
 | Charles Haynes Haswell - Engineering - 1851 - 346 pages
...and angles are equal or unequal, and they an named from the number of their sides or angles. Thus : A Pentagon has five sides. A Hexagon " six " • A..." . " '• A Decagon * ten " An Undecagon " eleven " . . A Dodecagon " twelve '* A CIRCLE is a plane figure bounded by a curve line, called the Circumference... | |
 | Edward Shaw - Architecture - 1852 - 426 pages
...number of their sides or angles. 39. A. pentagon is a polygon of five sides. A hexagon has six sides, a heptagon seven, an octagon eight, a nonagon nine,...an undecagon eleven, and a dodecagon twelve sides. 40. A regular polygon has all its sides and angles equal ; and if they are not equal, the polygon is... | |
 | James B. Dodd - Arithmetic - 1852 - 410 pages
...triangles ABD and CDS. § 388. A pentagon is a polygon of five sides ; a hexagon has six sides, — a heptagon seven, — an octagon eight, — a nonagon...nine, — a decagon ten, — an undecagon eleven, — a dodecagon twelve, &c. § 389. A regular polygon is one which 'has all its sides equal, and all... | |
 | Ezra S. Winslow - Business mathematics - 1853 - 264 pages
...sides. A Regular Polygon has all its sides equal. An Irregular Polygon has not all its sides equal. A Pentagon has five sides ; a hexagon, six ; a heptagon,...nonagon, nine ; a decagon, ten ; an undecagon, eleven ; a dodecagon, twelve. The Perimeter of a figure is its bounds, limits, or outline. It is to other... | |
 | Charles Haynes Haswell - Engineering - 1853 - 318 pages
...and angles are equal or unequal, and they ai« named from the number of their sides or angles. Thus : A Pentagon has five sides. A Hexagon " six " A Heptagon..." eight " A Nonagon " nine " A Decagon " ten " An Undecagou " eleven " A Dodecagon " twelve " A CIRCLE is a plane figure bounded by a curve line, called... | |
 | Lucius D. Gould - Carpentry - 1853 - 234 pages
...GEOMETRICAL DEFINITIONS. 7 • 37. A pentagon is a polygon of five sides ; a hexagon, of six sides ; a heptagon, seven ; an octagon, eight ; a nonagon,...undecagon, eleven ; and a dodecagon, twelve sides. 38. A regular polygon has all its sides and all its angles equal. If they are not both equal, the polygon... | |
 | Lucius D. Gould - 1857 - 464 pages
...their sides oi angh'¿, thu.¿ : 87. A pentagon is a polygon of five sides ; a hexagon, of six sides ; a heptagon, seven ; an octagon, eight ; a nonagon,...undecagon, eleven; and a dodecagon, twelve sides. 38. A regular polygon has all its sides and all its angles equal. If they are not both equal, the polygon... | |
 | John Weale - Architecture - 1859 - 622 pages
...is a polygon of five sides, a hexagon of six sides, a heptagon seven, an octagon eight, an enneagon nine, a decagon ten, an undecagon eleven, and a dodecagon twelve sides. A regular polygon has all its sides and its angles equal ; and if they are not equal, the polygon is... | |
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Hexagon, of six sides; a Heptagon, seven; an Octagon, eight; a Nonagon, nine ; a Decagon, ten ; an Undecagon, eleven ; and a Dodecagon, twelve sides. 
