...by more than four straight lines, as ABODE. 39. A POLYGON of five sides is called a Pentagon ; one of six sides, a Hexagon ; of seven sides, a Heptagon;...of nine sides, a Nonagon ; of ten sides, a Decagon, &c. I PROBLEMS. PEOB. I. To draw a straight line parallel to AB, and as far from it as the point C...

...sides, is called a polygon.^ The lowest polygon, that of three sides, is called a triangle ;J that of four sides, a quadrilateral; of five sides, a pentagon...sides, a heptagon; of eight sides, an octagon; of nine, a nonagon ; of ten, a decagon ; of eleven, an undecagon ; and of twelve, a dodecagon. There are four...

...B more than four straight lines, as ABODE. D 39. A POLYGON of five sides is called a Pentagon ; one of six sides, a Hexagon; of seven sides, a Heptagon;...of nine sides, a Nonagon; of ten sides, a Decagon, &c. 40. A REGULAR POLYGON is that which has all its sides and all its angles equal, as ABCDEP. CD 41....

...figure of four sides a quadrangle, a 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....

...Sit. VII.— OF POLYGONS IN GENERAL. DEFINITIONS. 1. A polygon of five sides is called a PENTAGON; one of six sides, a HEXAGON ; of seven sides, a HEPTAGON ; of eight sides, an OCTAGON ; of ten sides, a DECAGON ; of twelve sides, a DODECAGON. 2. A regular polygon is one which is both equilateral...

...particular names from the number of their sides and angles ; thus a polygon of five sides is called a PENTAGON ; of six sides, a HEXAGON ; of seven sides, a HEPTAGON ; of eight sides, an OCTAGON, etc. 32. The ALTITUDE of a triangle or parallelogram is the perpendicular drawn from the opposite angle...

...Polygon is a plane figure bounded by straight lines. A REGULAR POLYGON has equal sides and equal angles. A polygon of three sides is called a Triangle, of...seven sides a Heptagon, of eight sides an Octagon, etc. 409. Mensuration treats of the measurement of lines, planes, and solids or volumes (Art. 199)....

...rectilineal figure ABDEFG, page 63, is a regular polygon. 193. A regular polygon of five sides is called a pentagon ; of six sides, a hexagon ; of seven sides,...of nine sides, a nonagon ; of ten sides, a decagon. 194. The CENTRE of a regular polygon is a point -within, equidistant from the angular points. It is...

...Polygon is a plane figure bounded by straight lines. A REGULAR POLYGON has equal sides and equal angles. A polygon of three sides is called a Triangle, of...seven sides a Heptagon, of eight sides an Octagon, etc. 409. Mensuration treats of the measurement of lines, planes, and solids or volumes (Art. 199)....

...to the equilateral triangle and the square. A polygon of Jive sides, is calltd a pentagon ; of sir sides, a hexagon ; of seven sides, a heptagon; of eight sides, an octagon; 'o. A polygon of ten sides is called t decagon; of twelve sides, a duodecagon ; and of ./:!/•'""...