| George Park Fisher - 1888 - 166 páginas
...doubt. We may never have seen London, but we have not a whit more doubt that London exists than we have that the sum of the three angles of a triangle is equal to two right angles. We never saw Napoleon the First, but we are not less certain that Napoleon lived than we are... | |
| George Albert Wentworth - 1888 - 264 páginas
...third side, and their difference is less than the third side. PROPOSITION XXIII. THEOREM. -/ 138. The sum of the three angles of a triangle is equal to two right angles. A Let ABC be a triangle. To prove Z B + Z BCA + ZA = 2 rt. A. Proof. Suppose CE drawn II to... | |
| George Johnston Allman - 1889 - 266 páginas
...Thales can be 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 (d), refers to the discovery of the property of a circle that all triangles described... | |
| Seth Thayer Stewart - 1891 - 422 páginas
...triangle, formed by extending the sides in the same order, is equal to six right angles. PROP. XVII. The sum of the three angles of a triangle is equal to two right angles. PROP. XVIII. The sum of any two angles of a triangle is equal to the supplement of the third... | |
| George Irving Hopkins - 1891 - 210 páginas
...side of a triangle is less than the sum of the other two, and greater than their difference. 98. The sum of the three angles of a triangle is equal to two right angles. Sug. Consult Theorems 58 and 87. 99. If one side of a triangle be extended, the exterior angle... | |
| Jean-Jacques Rousseau - 1892 - 424 páginas
...the place of mathematical demonstration. No experimental process can ever establish the general truth that the sum of the three angles of a triangle is equal to two right angle?. We should not confound " geometrical recreations " with geometrical science.—(P.) f Isoperimetric... | |
| Jean-Jacques Rousseau - 1892 - 424 páginas
...the place of mathematieal demonstration. No experimental process can ever establish the general truth that the sum of the three angles of a triangle is equal to two right angles. We should not confound " geometrical recreations " with geometrical science. — (P.) f Isoperimetric... | |
| William Ezra Worthen - 1892 - 850 páginas
...equal to the three angles of the triangle, and their sum is equal to two right angles. Therefore, the sum of the three angles of a triangle is equal to two right angles. On one side of a triangle (Fig. 50) construct a triangle equal to the first, with opposite... | |
| Florian Cajori - 1893 - 478 páginas
...axioms, and, in short, came to make perfect demonstrations. In this way he arrived unaided at the theorem that the sum of the three angles of a triangle is equal to two right angles. His father caught him in the act of studying this theorem, and was so astonished at the sublimity... | |
| William C. Bartol - 1893 - 106 páginas
...lines cannot meet. 353. Any side of a triangle is less than the sum of the other two sides. 354. The sum of the three angles of a triangle is equal to two right angles. 355. Two triangles are equal in all respects when two sides and the included angle of the one... | |
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