 | John Hall - Christian education - 1875 - 428 pages
...an opinion as we please ; if we reject a fact, we only advertise our stupidity. If a man denies that the three angles of a triangle are together equal to two right angles, we can demonstrate the proposition. If he says that Brutus did not kill Csesar, we can open the books... | |
 | Richard Wormell - 1876 - 268 pages
...XVIII. The exterior angle of any triangle is equal to the two interior and opposite angles together, and the three angles of a triangle are together equal to two right angles. Let А В С be a triangle of which А С D is the exterior angle ; then shall and Л С А В + ЛABC+... | |
 | Francis Cuthbertson (geometer.) - 1876 - 102 pages
...is = the two angles BAC, ABC together. Wherefore if one side of a triangle &c. QED PROPOSITION XX. The three angles of a triangle are together equal to two right angles. Let ABC be a A. Then shall its three angles be together equal to two right angles. Produce BCtoD. Then... | |
 | Matthew R. Miller - Christianity and other religions - 1876 - 276 pages
...probably a horrible Inquisition would have flourished for a century, founded on the question whether the three angles of a triangle are together equal to two right angles. I have had some knowledge by personal experience of the unfairness of Universalists in their arguments... | |
 | E. S. Burchett - Geometry - 1876 - 188 pages
...study of Euclid should observe the following points, that may be culled from the First Book : — 1st. The three angles of a triangle are, together, equal to two right angles, invariably. 2nd. The triangle has the same number of equal sides that it has equal angles. 3rd. The... | |
 | 1878 - 958 pages
...and as we do so we discover that they have certain properties involved in their very nature, and that the three angles of a triangle are together equal to two right angles, and that parallel lines cannot meet. The properties of the ellipse, as demonstrated by Apollonius,... | |
 | Edward Harri Mathews - 1879 - 94 pages
...necessarily true as it stands ? Having completed the enunciation, prove the proposition. 3. Prove that the three angles of a triangle are together equal to two right angles ; and investigate the sum of the exterior angles of any plane convex polygon. 4. Show how to bisect... | |
 | Aristotle, Walter Mooney Hatch - Ethics - 1879 - 660 pages
...iuquiry : — if. matters with which Science deals are matters of inquiry, as, for instance, whether the angles of a triangle are together equal to two right angles, or whether the moon has a spherical shape. Good Counsel is, therefore, not identical with Inquiry. 2.... | |
 | Henry Angel - Geometry, Plane - 1880 - 372 pages
...180°. When it equals that angle, the plane containing them is perpendicular to the hp This is obvious, as the three angles of a triangle are together equal to two right angles, and the lines have their greatest inclinations when they are contained by a vertical plane. The angle... | |
 | Henry Angel - 1880 - 360 pages
...180°. When it equals that angle, the plane containing them is perpendicular to the hp This is obvious, as the three angles of a triangle are together equal to two right angles, and the lines have their greatest inclinations when they are contained by a vertical plane. The angle... | |
| |
... the three angles of a triangle are together equal to two right angles, although it is not known to all. 
