 A polygon is a plane figure bounded by straight lines. A polygon of three sides is a triangle; of four sides, a quadrilateral; of five sides, a pentagon; of six sides, a hexagon; of eight sides, an octagon; of ten sides, a decagon ; of twelve sides, a...  Grammar School Arithmetic - Page 368by Adelia Roberts Hornbrook - 1900 - 416 pagesFull view - About this book
 | Susanna Mary Paull - 1852 - 270 pages
...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.... | |
 | Euclides - 1865 - 80 pages
...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... | |
 | Henry Bartlett Maglathlin - Arithmetic - 1869 - 332 pages
...straight lines. A REGULAR POLYGON has equal sides and equal angles. A polygon of three sides is called a Triangle, of four sides a Quadrilateral, of five...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).... | |
 | Henry Bartlett Maglathlin - Arithmetic - 1873 - 362 pages
...straight lines. A REGULAR POLYGON has equal sides and equal angles. A polygon of three sides is called a Triangle, of four sides a Quadrilateral, of five...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).... | |
 | Samuel Mecutchen, George Mornton Sayre - Arithmetic - 1877 - 200 pages
...or lines. A Polygon is a plane figure bounded by straight lines. A polygon of three sides is called a Triangle; of four sides, a Quadrilateral; of five sides, a Pentagon; of six sides, a Hexagon, etc. TRIANGLES. A Triangle is a plane figure bounded by three straight lines. A Scalene Triangle has... | |
 | Frank Herbert Loud - Geometry - 1880 - 134 pages
...intersections in which the sides terminate are called vertices. 125. A polygon of three sides is called a triangle; of four sides, a quadrilateral; of five sides, a- pentagon; of six, a hexagon, etc. A quadrilateral having no two sides parallel is called a trapezium; if two sides are... | |
 | Joseph Ficklin - Arithmetic - 1881 - 412 pages
...the distance around it, and is equal to the sum of all its sides. A polygon of three sides is called a Triangle ; of four sides, a Quadrilateral; of five sides, a Pentagon; of six sides, a Hexagon ; etc. 6O9. A Triangle is a polygon of three sides ; as ABC. The Base of a triangle is the side on... | |
 | Evan Wilhelm Evans - Geometry - 1884 - 170 pages
...parallelogram. SECTION VII.—POLYGONS. DEFINITIONS. 1. A polygon of five sides is a pentagon; one of six sides, a hexagon; of seven sides, a heptagon; of eight, an octagon; of ten, a decagon; of twelve, a dodecagon. 3. The perimeter of a polygon is the sum of... | |
 | James William Nicholson - Arithmetic - 1885 - 348 pages
...polygon is equilateral when its sides are all equal to one another. A polygon of three sides is called a triangle ; of four sides, a quadrilateral ; of five sides, a pentagon ; of six sides, a hexagon ; etc. Draw a triangle ; a quadrilateral ; a pentagon ; a hexagon. What is a circle ? What is the diameter... | |
 | John Homer French - Arithmetic - 1889 - 512 pages
...taken for the base. It is always perpendicular to the base. (See 581, Note.) 583, A polygon is called Of five sides a pentagon. Of six sides a hexagon. Of seven sides a heptagon. A polygon is called Of eight sides an octagon. Of nine sides a nonagon. Of ten sides a decagon. EXERCISES.... | |
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