| John Playfair - Euclid's Elements - 1842 - 332 pages
...angle ; wherefore the other ADC is greater than a right angle. COR. From this it is manifest, that **if one angle of a triangle be equal to the other two, it is a right angle,** because the angle adjacent to it is equal to the same two ; and when the adjacent angles are equal,... | |
| Euclid - Geometry - 1845 - 218 pages
...angle of the less segment is said to be less, than a right angle.' COB. From this it is manifest, that **if one angle of a triangle be equal to the other two, it is a right angle,** because the angle adjacent to it is equal to the same two ; and when the adjacent angles are equal,... | |
| Euclid, James Thomson - Geometry - 1845 - 380 pages
...3. If a triangle have a right angle, the remaining angles are together equal to a right angle : and **if one angle of a triangle be equal to the other two, it is a right angle.** Cor. 4. The angles at the base of a right-angled isosceles triangle are each half a right angle. Cor.... | |
| Euclides - 1845 - 544 pages
...of the less segment is said to be less, than a right angle." . COR. From this it is manifest, that **if one angle of a triangle be equal to the other two, it is a right angle** : because the angle adjacent to it is equal to the same two ; (i. 32.) and when the adjacent angles... | |
| John Playfair - Euclid's Elements - 1846 - 332 pages
...angle ; wherefore the other ADC is greater than a right angle. COR. From this it is manifest, that **if one angle of a triangle be equal to the other two, it is a right angle,** because the angle adjacent to it is equal to the same two ; and when the adjacent angles are equal,... | |
| Euclides - 1846 - 292 pages
...semicircle, is greater than a right angle. Wherefore, The angle tyc. QED COR. From this it is manifest, that, **if one angle of a triangle be equal to the other two, it is a right angle,** because the angle adjacent to it is equal to the same two ; and, when the adjacent angles are equal,... | |
| Dennis M'Curdy - Geometry - 1846 - 168 pages
...they are equal two and two: therefore EBA and ECA are equal to EAB and EAC, or the whole angle BAC. **But if one angle of a triangle be equal to the other two, it** must be a right angle (4); therefore BAC, an angle in a semicircle, is a right angle, as stated. gle:... | |
| Great Britain. Admiralty - Geometry - 1846 - 130 pages
...trapezium to the 4 angles, is the least, when that point is the intersection of the diameters. 32. **If one angle of a triangle be equal to the other two** together, it is a right angle. 33. The diameters of a rhombus bisect each other at right angles. 34.... | |
| Great Britain. Admiralty - Geometry - 1846 - 130 pages
...trapezium to the 4 angles, is the least, when that point is the intersection of the diameters. 32. **If one angle of a triangle be equal to the other two** together, it is a right angle. 33. The diameters of a rhombus bisect each other at right angles. 34.... | |
| Euclid, Thomas Tate - 1849 - 120 pages
...angle of the less segment is said to be less, than a right angle.' COB. From this it is manifest, that **if one angle of a triangle be equal to the other two, it is a right angle,** because the angle adjacent to it is equal to the same two; and when the adjacent angles are equal,... | |
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