| New York (State) School for the deaf, White Plains - 1854
...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... | |
| REV JAMES BALMES. - 1856
...to 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... | |
| Thing - 1857
...geometry ; 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... | |
| Rev. Alexander Carson - 1857 - 552 páginas
...has 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.... | |
| Elias Loomis - 1858 - 234 páginas
...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... | |
| British Association for the Advancement of Science. Meeting - 1858
...to their investigation practically and scientifically, 101. Angles, on infinite, 3 ; a demonstration **that the three angles of every triangle are equal to two right,** 4. Animals, on the presence of copper in the tissues of, 55 ; on the dispersion of domestic, in connexion... | |
| British Association for the Advancement of Science - 1858
...to their investigation practically and scientifically, 101. Angles, on infinite, 3 ; a demonstration **that the three angles of every triangle are equal to two right,** 4. Animals, on the presence of copper in the tissues of, 55 ; on the dispersion of domestic, in connexion... | |
| John Fry Heather - 1859 - 170 páginas
...equal to the two angles HI A and '•A HAI; and because the vertical angles AVH and IVE are equal, and **that the three angles of every triangle are equal to two right angles,** therefore the two angles VIE and s EH are, together, equal to the two angles AH v and HAI, and therefore... | |
| Frederick Augustus Griffiths - 1859 - 354 páginas
...radii, its sides become the sines of the opposite angles, or the cosines of the adjacent augles. 5. **The three angles of every triangle are equal to two right angles** ; hence the obilque angles of a right-angled triangle are each other's complements. 6. The sum of the... | |
| Thomas Stantial - 1859
...and all the angles made by any number of lines meeting in a point are equal to four right angles. B. **The three angles of every triangle are equal to two right angles.** C. The angles at the base of an isosceles triangle are equal to one another. D. Construct a parallelogram... | |
| |