 | Trinity College (Hartford, Conn.) - 1870 - 1008 Seiten
...side of a triangle is less than the sum and greater than the difference of the other two sides. 2. The sum of the three angles of a triangle is equal to two right angles. 3. The diagonals of a parallelogram bisect each other. 4. An inscribed angle is measured by... | |
 | Elias Loomis - 1871 - 302 Seiten
...the sum of its angles diminished by two right angles, and multiplied by the quadrantal triangle. Cor. If the sum of the three angles of a triangle is equal to three right angles, its surface will be equal to the quadrantal triangle ; if the sum is equal to four... | |
 | Henry Barnard - 1872 - 988 Seiten
...catch either into other cogged wheels, or into pinions, or into trundles, Ac. Of the Triangk. — The sum of the three angles of a triangle is equal to two right-angles, Ac. Of similar Triangles. — Two triangles are similar when the angles of one are equal... | |
 | Henry Barnard - 1872 - 984 Seiten
...catch either into other cogged wheels, or into pinions, or into trundles, Ac. Of the Triangle. — The sum of the three angles of a triangle is equal to two right-angles, Ac. Of eimiiar Triangle*. — Two triangles are similar when the ingles of one ar» equal... | |
 | New York Board of Education, New York (N.Y.). Board of Education - 1873 - 166 Seiten
...side in -each respectively equal ; (c) when they have three sides in each respectively equal. 6. The sum of the three angles of a triangle is equal to two right angles. I7. The sum of the interior angles of a polygon is equal to twice as many right angles as the... | |
 | 1874 - 520 Seiten
...heartfelt pleasure and profound satisfaction from the contemplation of that wonderful truth, that the sum of the three angles of a triangle is equal to two right angles. My friend, who sits before me, used to take particular delight in putting this at me, when... | |
 | 1874 - 508 Seiten
...heartfelt pleasure and profound satisfaction from the contemplation of that wonderful truth, that the sum of the three angles of a triangle is equal to two right angles. My friend, who sits before me, used to take particular delight in putting this at me, when... | |
 | Henry Kiddle, Thomas F. Harrison, Norman Allison Calkins - 1875 - 294 Seiten
...equality as a definite fact, and inequality indefinitely. Thus, it is required to be proved that the sum of the three angles of a triangle is equal to two right angles ; also, that, of any two sides of a triangle, that which lies opposite to the greater angle... | |
 | Aaron Schuyler - 1876 - 384 Seiten
...equal. 76. Exercises. 1. Prove by means of the annexed diagram, in which DE is parallel to AC, that the sum of the three angles of a triangle is equal to two right angles. 2. The sum of the three straight lines drawn from any point within a triangle to the vertices... | |
 | 1877 - 626 Seiten
...drawn from the preceding notices. First inference. — Thales must have known the theorem that the sum of the three angles of a triangle is equal to two right angles. Pamphila, in [<f], refers to the discovery of the property of a circle that all triangles described... | |
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After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles... 
