 | 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,... | |
 | 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... | |
 | 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... | |
 | Peter Nicholson - Mathematics - 1825 - 372 pages
...angle. ELEMENTS OF KL'CI.I.), 161 29. An acute-angled triangle ¡s 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.... | |
 | 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,... | |
 | 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.... | |
 | 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.... | |
 | 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.... | |
 | 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... | |
 | 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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An oblong is that which has all its angles right angles, but has not all its sides equal. 
