 | William Jay Youmans - 1897 - 902 страница
...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... | |
 | 1878 - 804 страница
...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... | |
 | George Albert Wentworth - 1896 - 68 страница
...triangle is greater than the third side, and their difference is less than the third side. 138. The sum of the three angles of a triangle is equal to two right angles. 139. Cor. 1. If the sum of two angles of a triangle is subtracted from two right angles, the... | |
 | Joe Garner Estill - 1896 - 186 страница
...value. Princeton, June, 1896. State what text-book you have read and how much of it. 1. Prove that the sum of the three angles of a triangle is equal to two right angles ; and that the sum of all the interior angles of a polygon of u sides is equal to (n—2) times... | |
 | Joe Garner Estill - 1896 - 168 страница
...s= — g (Use logarithms.) Princeton, June, 1894. What text-book have you read ? 1. Prove that the sum of the three angles of a triangle is equal to two right angles. Define triangle, right angle, right triangle, scalene triangle. 3. Prove that an angle inscribed... | |
 | Ephraim Hunt - 1896 - 120 страница
...three angles of any triangle ? LESSON XXV. Review Lesson XIV. Draw any scalene triangle. PROBLEM. The sum of the three angles of a triangle is equal to two right angles. Solution. Letter the triangle, and produce the base to D. (1) The exterior angle and its adjacent... | |
 | Albert Newton Raub - 1897 - 272 страница
...substituted. Truism for truth. — A truism is a self-evident truth ; as, " All men are bipeds." " The sum of the three angles of a triangle is equal to two right angles " is a truth, but it needs proof or demonstration, and is not therefore a truism. Try for make.... | |
 | Florian Cajori - 1898 - 512 страница
...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... | |
 | 1898 - 228 страница
...circular sheet of tin 16 inches in diameter and weighing 8.2 ounces per square foot. JUNE 1896. (a) 1. The sum of the three angles of a triangle is equal to two right angles. 2. Construct a circle having its center in a given line and passing through two given points.... | |
 | Arthur A. Dodd, B. Thomas Chace - 1898 - 490 страница
...logarithms.) Princeton, June, Í896. State what text-book you have read and how much of it. 1. Prove that the sum of the three angles of a triangle is equal to two right angles; and that the sum of all the interior angles of a polygon ofя sides is equal to (n — 2) times... | |
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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... 
