 | James Maurice Wilson - 1868 - 132 σελίδες
...it make the angles FGH=A, and HGK=B, then KGE will equal the third angle of the triangle, since the sum of the three angles of a triangle is equal to two right angles. At C and D make angles equal to HGK and KGE, and let their sides meet in O; then OCD is the... | |
 | 1869 - 794 σελίδες
...will be great.y developed. For example, the child can be led to discover, by means of his protractor, that the sum of the three angles of a triangle, is equal to two right-angles, or that the vertical angles formed by the intersection of two lines, are equal. When... | |
 | Bowdoin College - 1870 - 428 σελίδες
...those so easy to gather every day, would be to deny a truth which in its way is as plainly shown as that the sum of the three angles of a triangle is equal to two right angles. If now it is announced to us that for the production of another kind of dropsy there is needed... | |
 | Trinity College (Hartford, Conn.) - 1870 - 1008 σελίδες
...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... | |
 | Henry Barnard - 1872 - 984 σελίδες
...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... | |
 | Henry Barnard - 1872 - 988 σελίδες
...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... | |
 | New York Board of Education, New York (N.Y.). Board of Education - 1873 - 166 σελίδες
...idea of 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... | |
 | 1874 - 508 σελίδες
...derived such 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 σελίδες
...idea of 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 σελίδες
...therefore 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... | |
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Thus the proposition, that the sum of the three angles of a triangle is equal to two right angles, (Euc. 
