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 Bøker Bok 41–50 av 184 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 ## Education, Volum 27

1907
...scientific accuracy is proverbial. It is susceptible of definite proof that two and two make four; that the, sum of the three angles of a triangle is equal to two right angles and nothing else. There need never be any question as to what will result when carbon burns...
Uten tilgangsbegrensning - Om denne boken ## New Practical Algebra: Adapted to the Improved Methods of Instruction in ...

James Bates Thomson - 1880 - 312 sider
...on. Hence, the proposition must be universally true. 466. In Geometry, we have the proposition : TJie sum of the three angles of a triangle is equal to two right angles. We find it to be true in one case ; then in another, etc. Hence, we conclude the proposition...
Uten tilgangsbegrensning - Om denne boken ## Elements of Geometry

George Albert Wentworth - 1881 - 250 sider
...perpendicular, each to each, they are either equal or supplementary. PROPOSITION XXI. THEOREM. 98. The sum of the three angles of a triangle is equal to two right angles. BE С Let AB С be a triangle. We are to prove ¿ B + ZB С A + ¿ A = two rt. A. Draw С E...
Uten tilgangsbegrensning - Om denne boken ## Elements of geometry, tr. by J. Kaines

Alexis Claude Clairaut - 1881
...opposite sides of a straight line which cuts two parallels ........ 36 These angles are equal 37 64. The sum of the three angles of a triangle is equal to two right angles 37 68. The exterior angle of a triangle is equal to the sum of its two interior opposite angles...
Uten tilgangsbegrensning - Om denne boken ## Practical Logic: Or, The Art of Thinking

D. S. Gregory - 1881 - 210 sider
...best policy. 15. Education cannot be effected by mere class-room instruction or lecturing. 16. The sum of the three angles of a triangle is equal to two right angles. 17. Two straight lines cannot inclose a space. 18. The earth is between 93,000,000 and 94,000,000...
Uten tilgangsbegrensning - Om denne boken ## Elements of Geometry

George Albert Wentworth - 1882 - 250 sider
...perpendicular, each to each, they are either equal or supplementary. PROPOSITION XXI. THEOREM. 98. The sum of the three angles of a triangle is equal to two rig/'t angles. С Let ABC be a triangle. We are to prove Z. B + ZB С A + ZA = two rt. A. Draw С E...
Uten tilgangsbegrensning - Om denne boken ## Studies in logic. By members of the Johns Hopkins university

Studies - 1883 - 203 sider
...analysis of the nature of probability. 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 then continues : " But another man who never...
Uten tilgangsbegrensning - Om denne boken ## The Journal of speculative philosophy: Ed. by Wm. T. Harris. microform, Volum 18

1884
...negation ; and, of course, what is true of triangle is true of all general ideas ; they are negations. The sum of the three angles of a triangle is equal to two right angles. This is a proposition to be demonstrated. I draw a triangle, and prove that the three angles...
Uten tilgangsbegrensning - Om denne boken ## THE JOURNAL OF SPECULATIVE PHILOSOPHY

WILLIAM T HARRIS - 1884
...negation ; and, of course, what is true of triangle is true of all general ideas ; they are negations. The sum of the three angles of a triangle is equal to two right angles. This is a proposition to be demonstrated. I draw a triangle, and prove that the three angles...
Uten tilgangsbegrensning - Om denne boken ## Psychology [transl.].

Antonio Rosmini-Serbati - 1885
...mathematical affirmations — for example, "The consequence is contained in the principle," or " The sum of the three angles of a triangle is equal to two right angles " — then the copulative is signifies only ideal being. If the affirmation descends to the...
Uten tilgangsbegrensning - Om denne boken