| Euclid, Isaac Todhunter - Euclid's Elements - 1883 - 400 pages
...[Hypothesis. which is absurd. Therefore the angles ABC and DEF are not unequal ; that is, they are **equal. And the angle at A is equal to the angle at D;** [Hypothesis. therefore the remaining angle at C is equal to the remaining angle at F ; EUCLID'S ELEMENTS.... | |
| Euclid
...angle DEF; therefore it is equal to it. But the angle at A is also equal to the angle at D ; therefore **the remaining angle at C is equal to the remaining angle at F.** [i. 32] Therefore the triangle ABC is equiangularwith the triangle DEF. But, again, let each of the... | |
| |