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 Bøker Bok 61–70 av 188 på After remarking that the mathematician positively knows that the sum of the three... After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles... Elements of Geometry and Trigonometry - Side 65
av C. Davies - 1867
Uten tilgangsbegrensning - Om denne boken ## Greek Geometry from Thales to Euclid

George Johnston Allman - 1889 - 237 sider
...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...
Uten tilgangsbegrensning - Om denne boken ## Manual of Plane Geometry: On the Heuristic Plan, with Numerous Extra ...

George Irving Hopkins - 1891 - 179 sider
...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...
Uten tilgangsbegrensning - Om denne boken ## Plane and Solid Geometry

Seth Thayer Stewart - 1891 - 406 sider
...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...
Uten tilgangsbegrensning - Om denne boken ## Appletons' Cyclopædia of Technical Drawing: Embracing the Principles of ...

Appleton, firm, publishers, New York - 1892 - 745 sider
...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...
Uten tilgangsbegrensning - Om denne boken ## Émile: Or, Treatise on Education

Jean-Jacques Rousseau - 1892 - 363 sider
...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...
Uten tilgangsbegrensning - Om denne boken ## Rousseau's Émile: Or, Treatise on Education

Jean-Jacques Rousseau - 1892 - 355 sider
...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...
Uten tilgangsbegrensning - Om denne boken ## THE ELEMENTS OF SOLID GEOMETRY

WILLIAM C. BATOL, A.M., - 1893
...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...
Uten tilgangsbegrensning - Om denne boken ## Teachers' Manual for Teachers Using Arithmetic by Grades

John Tilden Prince - 1894
...point is equal to 360°. 6. The opposite angles made by two lines crossing each other are equal. 7. The sum of the three angles of a triangle is equal to two right angles. The sum of the angles of a polygon is equal to two right angles taken as many times as the...
Uten tilgangsbegrensning - Om denne boken ## Appletons' Popular Science Monthly, Volum 50

William Jay Youmans - 1897
...invention, and judgment" Instead of a series of written proofs to memorize, such as, for instance, the sum of the three angles of a triangle is equal to two right angles, the student takes the triangle, and, with suggestions from the teacher where necessary, works...
Uten tilgangsbegrensning - Om denne boken ## The Popular Science Monthly, Volum 12

1878
...inferences. Locke explains it as follows: After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles because he apprehends the geometrical proof, he thus continues : " But another man who never...
Uten tilgangsbegrensning - Om denne boken