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" A Polygon of three sides is called a triangle ; one of four sides, a quadrilateral; one of five sides, a pentagon; one of six sides, a hexagon; one of seven sides, a heptagon; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve... "
Manual of Geometry and Conic Sections: With Applications to Trigonometry and ... - Page 19
by William Guy Peck - 1876 - 366 pages
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Plane and Solid Geometry

George Albert Wentworth - Geometry - 1904 - 496 pages
...mutually equilateral and mutually equiangular, they are equal, for they can be made to coincide. 204. ~A polygon of three sides is called a triangle ; one...of four sides, a quadrilateral; one of five sides, & pentagon; one of six sides, a hexagon ; one of seven sides, a heptagon ; one of eight sides, an octagon...
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Handbook of Mathematics for Engineers and Engineering Students

Joseph Claudel - Mathematics - 1906 - 758 pages
...angle of the polygon. Any line AC joining two vertices not adjacent is a diagonal of the polygon. 632. A polygon of three sides is called a triangle; one of four sides, a quadrilateral; one of five, a pentagon; one of six, a hexagon; one of seven, a heptagon; one of eight, an octagon ; one of nine,...
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Excavating, Shoring, and Piling: Footings and Foundations; Areas, Vaults ...

International Correspondence Schools - Building - 1909 - 750 pages
...— A polygon is a THE STEEL SQUARE Polygons are classified according to the number of their sides: A polygon of three sides is called a triangle; one...sides, a heptagon; one of eight sides, an octagon; one of nine sides, a noliogon; one of ten sides, a decagon; one of eleven sides, an uudecagon; and...
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Complete Arithmetic

Samuel Hamilton - Arithmetic - 1909 - 530 pages
...A regular polygon of three sides is called an equilateral triangle ; one of four sides, a square ; one of five sides, a pentagon; one of six sides, a hexagon, etc. Finding the area of a regular polygon. Draw a circle. Divide the circumference into 6 equal parts...
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Elements of Plane Geometry

William Herschel Bruce, Claude Carr Cody (Jr.) - Geometry, Modern - 1910 - 286 pages
...case of triangles, two polygons may be mutually equilateral without being mutually equiangular. 191. A polygon of three sides is called a triangle; one...sides, a pentagon; one of six sides, a hexagon ; one of eight sides, an octagon ; one of ten sides, a decagon ; one of twelve sides a dodecagon ; one of fifteen...
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Plane Geometry

Clara Avis Hart, Daniel D. Feldman - Geometry, Modern - 1911 - 328 pages
...polygon. 91. Def. A polygon which is both equilateral and equiangular is a regular polygon. 92. Def. A polygon of three sides is called a triangle; one of four sides, a quadrilateral; one of live sides, a pentagon; one of six sides, a hexagon; and so on. TRIANGLES CLASSIFIED WITH RESPECT TO...
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Solid Geometry

Clara Avis Hart, Daniel D. Feldman, Virgil Snyder - Geometry, Solid - 1912 - 222 pages
...sides are col linear. 77. If two straight lines intersect, the vertical angles are equal. 92. Def. A polygon of three sides is called a triangle; one...five sides, a pentagon; one of six sides, a hexagon; and so on. 105. Two triangles are equal if a side and the two adjacent angles of one are equal respectively...
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Plane and Solid Geometry

Clara Avis Hart, Daniel D. Feldman - Geometry - 1912 - 504 pages
...polygon. 91. Def. A polygon which is both equilateral and equiangular is a regular polygon. 92. Def. A polygon of three sides is called a triangle ; one...five sides, a pentagon ; one of six sides, a hexagon ; and so on. TRIANGLES CLASSIFIED WITH RESPECT TO SIDES 93. Def. A triangle having no two sides equal...
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Shop Calculations ; Reading Working Drawings ; Measuring Instruments ...

Measuring instruments - 1914 - 428 pages
...AB CD EA is the perimeter. 25. Polygons are classified according to the number of their sides: One of three sides is called a triangle; one of four sides,...sides, a heptagon; one of eight sides, an octagon; one of ten sides, a decagon ; one of twelve sides, a dodecagon ; etc. 26. A regular polygon is one...
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Plane Geometry

John Charles Stone, James Franklin Millis - Geometry - 1916 - 306 pages
...according to the number of sides. A polygon of three sides is a triangle. A polygon of four sides is called a quadrilateral ; one of five sides, a pentagon ; one of six sides, a hexagon ; one of eight sides, an octagon ; one of ten sides, a decagon ; etc. 81. Quadrilaterals. — A trapezium is...
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