 | Samuel Bailey - Logic - 1851 - 254 pages
...or that the three angles of the triangle before me are together equal to two right angles, because the three angles of every triangle are equal to two right angles. The dictum, then, is obviously one of those selfevident maxims which we have above described, and it may... | |
 | Popular educator - 1852 - 842 pages
...reason of this construction is plain, .. ~~r from Prop. XXXII., Book I., Euclid, which asserts that the three angles of every triangle are equal to two right angles; and from Prop. XIII., Book I., which asserts that the anglet which one straight line mates with anoiJier... | |
 | 1853 - 618 pages
...would be no moral discipline in believing religious truths, any more than there is in believing that the three angles of every triangle are equal to two right angles, or any other proposition in Euclid. And in making our spiritual life one of faith, God has acted in... | |
 | Thomas Lund - Geometry - 1854 - 520 pages
...join OE; and let OE, or OE c produced meet the circumference in F. Then AOE is a triangle; and since the three angles of every triangle are equal to two right angles, and one of them in this case, viz. t OAE is a right angle, .'. each of the other two angles, tOEA,... | |
 | New York (State) School for the deaf, White Plains - 1854 - 936 pages
...triangle be produced, the exterior angle will be equal to the two interior and opposite angles ; and the three angles of every triangle are equal to two right angles." DBC Let ABC be a triangle, in which the side BC is produced towards D, then will the exterior angle... | |
 | Frederick Augustus Griffiths - Artillery drill and tactics - 1854 - 406 pages
...radii, its sides become the sines of the opposite angles, or the cosines of the adjacent angles. 5. The three angles of every triangle are equal to two right angles ; hence the oblique angles of a right-angled triangle are each other-s complements. 6. The sum of the... | |
 | Jaime Luciano Balmes - Philosophy - 1856 - 568 pages
...say, to a little more or less, but never be perfect exactness. Consequently we could not assert that the three angles of every triangle are equal to two right angles ; all that we could say would be, that so far as our experience goes, we have observed that in all... | |
 | Rev. Alexander Carson - Baptism - 1857 - 572 pages
...not a head for the philosophy of language : and I say this with as little bad feeling as I say that the three angles of every triangle are equal to two right angles. PASSAGES OF SCRIPTURE QUOTED OR REFERRED TO Chap. Ver. Page GENESIS, i. 26 .... 147 lii. 1 218 Chap.... | |
 | Thing - Literature - 1857 - 408 pages
...; he proceeded till he arrived at a proposition similar to the thirty-second of Euclid, viz., that the three angles of every triangle are equal to two right angles. While engaged with this theorem, he was surprised by his father, who, on learning the object of his... | |
 | Elias Loomis - Conic sections - 1858 - 256 pages
...part of four right angles (Prop. II., Sch. 1), or the third part of two right angles. Also, because the three angles of every triangle are equal to two right angles, the two angles OA*B, OBA are together equal to two thirds of two B^ right angles ; and since AO is equal... | |
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When you have proved that the three angles of every triangle are equal to two right angles... 
