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" 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. "
Walsh's Business Arithmetic - Page 480
by John Henry Walsh - 1919 - 496 pages
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Rainey's Improved Abacus: An Explanatory Treatise on the Theory and Practice ...

Thomas Rainey - Arithmetic - 1849 - 334 pages
...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 ; of six sides, a hexagon ; of seven sides, a heptagon; of eight sides, an octagon; of nine, a nonagon ; of ten, a decagon ; of eleven,...
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First Lessons in Geometry

Thomas Hill - Geometry - 1855 - 152 pages
...straight lines is a polygon ; and, if its vertices are in a circumference, it is an inscribed polygon. 2. A polygon of three sides is called a triangle ; of four sides a quadrangle ; of five sides a pentagon ; of six sides a hexagon. 3. Any polygon of more than three sides...
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Bryant and Stratton's Commercial Arithmetic: In Two Parts. Designed for the ...

Emerson Elbridge White - Arithmetic (Commercial), 1861 - 1861 - 348 pages
...an equivalent space. A rectilinear figure, or 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 a pentagon, of six a hexagon, and so on. A regular polygon is one whose sides and angles arc equal....
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The Normal Written Arithmetic: By Analysis and Synthesis, Designed for ...

Edward Brooks - 1863 - 344 pages
...larger than a right angle ; as, DEG. ' 462. A Polygon is a figure bounded by straight lines; as, ABODE. A Polygon of three sides is called a Triangle, of four sides, a Quadrilateral, etc. D c 463. The Area of a polygon is the number of square units in its surface. THE TRIANGLE. 464....
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The Florence Stories: Florence and John

Jacob Abbott - 1866 - 260 pages
...figure of eight sides. A figure of four sides is called a square. A figure of five sides is called a pentagon, of six sides a hexagon, of eight sides an octagon. There might be a figure of seven sides, but it would not be very easily made, and it would not be very...
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New Practical Arithmetic in which the Science and Its Applications are ...

Henry Bartlett Maglathlin - Arithmetic - 1869 - 332 pages
...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...five sides a Pentagon, of six sides a Hexagon, of seven sides a Heptagon, of eight sides an Octagon, etc. 409. Mensuration treats of the measurement...
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The Bryant and Stratton Business Arithmetic: A New Work, with Practical ...

Henry Beadman Bryant, Emerson Elbridge White, Corydon Giles Stowell - Business mathematics - 1872 - 576 pages
...it is an equilateral and equiangular figure. An irregular polygon has unequal sides and angles. 8. A polygon of three sides is called a triangle, of four sides a quadri, lateral, of ßve sides a pentagon, of »ix sides a hexagon, and so on. 4. Similar figures have...
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New Practical Arithmetic: In which the Science and Its Applications are ...

Henry Bartlett Maglathlin - Arithmetic - 1873 - 362 pages
...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...five sides a Pentagon, of six sides a Hexagon, of seven sides a Heptagon, of eight sides an Octagon, etc. 409. Mensuration treats of the measurement...
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The Normal Written Arithmetic: By Analysis and Synthesis, Designed for ...

Edward Brooks - Arithmetic - 1874 - 352 pages
...larger than a right angle ; as, DECr. 462. A Polygon is a figure bounded by straight lines; as, ABODE. A Polygon of three sides is called a Triangle, of four sides, a E < Quadrilateral, etc. D c 463. The Area of a polygon is the number of square units in its surface....
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The New American Arithmetic, Part 3

Samuel Mecutchen, George Mornton Sayre - Arithmetic - 1877 - 200 pages
...from the nature of its boundary line or lines. A Polygon is a plane figure bounded by straight lines. A polygon of three sides is called a Triangle; of...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...
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