| Sir John Leslie - 1809 - 493 Seiten
...An exterior angle of a triangle is equal to both its opposite interior angles, and all the interior **angles of a triangle are together equal to two right angles. The** exterior angle BCD, formed by the production of the side AC of the triangle ABC, is equal to the two... | |
| D. WILLIAM - 1810
...deduced. If we could demonftrate, independently of all confideration of parallel lines, that the three **angles of a triangle are together equal to two right angles, the** object in view would be accomplifhed, and the difficulty, in this part of the Elements, would be entirely... | |
| John Playfait - 1822
...deduced. If we could demonstrate, independently of all consideration of parallel lines, that the three **angles of a triangle are together equal to two right angles, the** object in view would be accomplished, and the difficulty, in this pait of the Elements, would be enVOL.... | |
| John Playfair - 1822
...deduced. If we could demonstrate, independently of all consideration of parallel lines, that the three **angles of a triangle are together equal to two right angles, the** object in view would be accomplished, and the difficulty, in this part of the Elements, would be entirely... | |
| Perry Fairfax Nursey - 1831
...before proved that the angle ADe is an acute angle of 90 degrees, whence it follows that as the three **angles of a triangle are together equal to two right angles, the** remaining angle /AD must likewise be an acute angle of 90 degrees, and, as before, since the two angles/... | |
| 1831
...before proved that the angle ADe is an acute angle of 90 degrees, whence it follows that as the three **angles of a triangle are together equal to two right angles, the** remaining angle fh D must likewise be an acute angle of 90 degrees, and, as before, since the two augles/DA... | |
| 1841
...assertion to be proved, in that the latter does not require any specific object to be effected. Thus, ' **all the angles of a triangle are together equal to two right angles** ' is to be shown or made evident, and is a theorem ; but ' to draw a circle through three given points... | |
| 1841
...assertion to be proved, in that the latter does not require any specific object to be effected. Thus, ' **all the angles of a triangle are together equal to two right angles** ' is to be shown or made evident, and is a theorem ; but ' to draw a circle through thiee given points'... | |
| Felix Eberty - 1846
...anything which contradicts it to be absurd. Thus, for example, he to whom the geometrical proposition that **the angles of a triangle are together equal to two right angles,** has been intelligibly demonstrated, must acknowledge the truth of it ; but he has not necessarily comprehended... | |
| Samuel Bailey - 1851
...An exterior angle of a triangle is equal to both its opposite interior angles, and all the interior **angles of a triangle are together equal to two right angles. The** exterior angle BCD formed by the production of the side AC of the triangle ABC, is equal to the / \... | |
| |