 | Thomas Cogswell Upham - Intellect - 1841 - 474 pages
...brought out by a successive comparison of propositions. We say, for instance, that a square is a figure, which has all its sides equal, and all its angles right angles. In this definition there is not only involved equality of sides, but equality of angles. And it is... | |
 | Euclides - 1842 - 316 pages
...which has an obtuse angle. XXIX. An acute-angled triangle is that which has three acute angles. XXX. Of four-sided figures, a square is that which has...its sides equal. XXXII. A rhombus is that which has all its sides equal, but its angles are not right angles. XXXIII. A rhomboid is that which has its... | |
 | John Playfair - Euclid's Elements - 1842 - 332 pages
...obtuse angle. 24. An acute angled triangle is that whick has three acute angles. 25. Of four sided figures, a square is that which has all its sides equal and all its angles right angles. 26. An oblong is that which has all its angles right angles, but has not all its sides equal. 27. A... | |
 | William Pease - Geometry - 1843 - 80 pages
...which has an obtuse angle. The two remaining angles will necessarily be acute. XXX. Of four -sided figures, a square is that which has all its sides...angles right angles, but has not all its sides equal. Its opposite sides are necessarily equal. XXXII. A rhombus is that which has all its sides equal, but... | |
 | Philip Kelland - Algebra - 1843 - 168 pages
...figures as contain more sides than angles, such as A., which are called by Zenodorus * In Def. 27. Of four-sided figures a square is that which has all its sides equal, and one of its angles a right angle. It has been properly objected to some of Euclid's definitions, that... | |
 | Euclides - 1845 - 546 pages
...triangle is that which has three acute angles. XXX. Of quadrilateral or four-sided figures, a square has all its sides equal and all its angles right angles....but has not all its sides equal. XXXII. A rhombus has all its sides equal, but its angles are not right angles. XXXIII. A rhomboid has its opposite sides... | |
 | Euclid - Geometry - 1845 - 218 pages
...which has an obtuse angle. XXIX. An acute-angled triangle, is that which has three acute angles. XXX. Of four-sided figures, a square is that which has...sides equal, and all its angles right angles. XXXI. XXXII. A rhombus, is that which has all its sides equal, but its angles are not right angles. XXX1I1.... | |
 | Scottish school-book assoc - 1845 - 444 pages
...which has one obtuse angle. 31. An acute angled triangle has all its angles acute. 32. Of four- sided figures, a square is that which has all its sides equal, and all its angles right angles. 33. A rectangle is that which has all its angles right angles, but all its sides are not equal. 34.... | |
 | Euclid, James Thomson - Geometry - 1845 - 382 pages
...also are two angles which are together equal to two right angles. -, A square is a four-sided figure which has all its sides equal and all its angles right angles. " A rhombns is a four-sided figure which has all its sides equal ; but its angles are not right angles."... | |
 | Euclides - 1846 - 292 pages
...: xxix. An acute-angled triangle is that which has three acute angles. Of four-sided figures, xxx. A square is that which has all its sides equal, and...is that which has all its angles right angles, but not all its sides equal : xxxn. A rhombus is that which has all its sides equal, but its angles are... | |
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A rhomboid, is that which has its opposite sides equal to one another, but all its sides are not equal, nor its angles right angles. 
