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" An oblong is that which has all its angles right angles, but has not all its sides equal. "
Mensuration of lines, areas, surfaces, and volumes - Page xv
by Robert Rawson - 1856
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The Youth's instructer [sic] and guardian, Volume 14

1854 - 1110 pages
...manifest that this in any rectilineal figure is equal to the number of sides. Def. 31. A regular polygon is that which has all its sides equal, and all its angles equal. Def. 32. A circk la a plane figure, bounded by a single curve line, called its circumference,...
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The First Six Books with Notes

Euclid - 1822 - 179 pages
...quadrilateral figure, Fig. \\. whose opposite sides are parallel. 31. A square is a quadrilateral figure, which has all its sides equal, and all its angles right angles. 32. Rectilineal figures, which have more than four sides, are called polygons. Postulates. 1 . Let...
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Universal Technological Dictionary: Or, Familiar Explanations of ..., Volume 2

George Crabb - Industrial arts - 1823 - 732 pages
...sides. The principal of these figures are as follow : namely — The square, ie a foursided figure, which has all its sides equal, and all its angles right angles, as ABCD, fig. 13. — An oblong square, a figure having all its angles right angles, but not all its...
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A Popular Course of Pure and Mixed Mathematics ...: With Tables of ...

Peter Nicholson - Mathematics - 1825 - 372 pages
...angle. ELEMENTS OF KL'CI.I.), 161 29. An acute-angled triangle ís that which has three acute anglesSO. Of four-sided figures, a square is that which has...its sides equal, and all its angles right angles. 31. An oblong, is that which has all its angles right angles, but has not all its sides equal. 32....
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Hints to Parents ...: No. I[-VI], Issues 1-6

Education - 1825 - 498 pages
...mathematical figures, The mother draws quadilateral figures of four equal sides. A four-sided figure which has all its sides equal, and all its angles right angles, is called a square. Try whether the square I have drawn is correct. She makes three squares of equal,...
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Elements of Arithmetic, Algebra, and Geometry

George Lees - 1826 - 266 pages
...XXV.— An acute angled triangle, is that which has three acute angles. Book I. XXVI. — Of four sided figures, a square is that which has all its sides equal, and all its angles right angles. XXVII. — An oblong, is that which has all its angles right angles, but has not all its sides equal....
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

Euclid, John Playfair - Euclid's Elements - 1826 - 326 pages
...that whieh has all its sides equal, and all its angles right angles. XXVI. An oblong, is that whieh has all its angles right angles, but has not all Its sides equal. XXVII. A rhombus, is that whieh has all its sides equal, but its angles are not right angles. XXVHI....
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The Elements of Euclid: The Errors by which Theon, Or Others, Have Long ...

Robert Simson - Trigonometry - 1827 - 513 pages
...an obtuse angle. A ^? A XXIX. An acute angled triangle, is that which has three acute angles. xxx. Of four-sided figures, a square is that which has...angles right angles, but has not all its sides equal. XXXII. A rhombus, is that which has all its sides equal, but its angles are not right angles. XXXIII....
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Elements of Geometry: Being Chiefly a Selection from Playfair's Geometry

John Playfair - Geometry - 1829 - 186 pages
...quadrilateral figures, a square Is that which has one right angle, and all its sides equal. 34. A rectangle is that which has all its angles right angles, but has not all its sides equal. 35. A parallelog"am is that which has its two opposite sides parallel. 36. A trapezium is a four-sided...
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Geometry, Plane, Solid, and Spherical, in Six Books: To which is Added, in ...

Pierce Morton - Geometry - 1830 - 584 pages
...its sides equal and all its angles equal ; and, since there is evidently some greatest, the greatest is that which has all its sides equal and all its angles equal. PROP. 27. Spherical pyramids, which stand upon equal bases, are equal to one another; to, likewise,...
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