 | Horatio Nelson Robinson - Arithmetic - 1892 - 428 pages
...sides. 495. The Area of a plane figure is the surface included within the lines which bound it. 1. A regular polygon has all its sides and all its angles equal. 2. A polygon of three sides is called a triangle; of four sides, a quadrilateral ; of five sides, a... | |
 | Horatio Nelson Robinson - Arithmetic - 1892 - 428 pages
...sides. 495. The Area of a plane figure is the surface included within the lines which bound it. 1. A regular polygon has all its sides and all its angles equal. 2. A polygon of three sides is called a triangle ; of four sides, a quadrilateral ; of five sides,... | |
 | Horatio Nelson Robinson - Arithmetic - 1895 - 526 pages
...to stand. 845. The Area of a plane figure is the surface included within the lines which bound it. A Regular Polygon has all its sides and all its angles equal. A lK'lygou of three sides is called a Triangle ; of four sides, a Tetragon, or Quadrilateral ; of five... | |
 | F. A. Brining, D. N. Avasia - Mechanical drawing - 1913 - 282 pages
...PRACTICAL PLANE GEOMETRY. POLYGONS. A polygon is a figure bounded by more than four straight lines. A regular polygon has all its sides and all its angles equal. The number of degrees in each angle of a regular polygon is equal to 180 vr~>N being the number of... | |
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A Pentagon is a polygon of five sides ; a Hexagon, of six sides ; a Heptagon, seven; an Octagon, eight; a Nonagon, nine ; a Decagon, ten ; an Undecagon, eleven ; and 4 Dodecagon, twelve sides. 
