 | Joe Garner Estill - Geometry - 1896 - 168 pages
...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 - Geometry - 1896 - 120 pages
...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 - English language - 1897 - 272 pages
...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.... | |
 | Mathematics - 1898 - 228 pages
...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.... | |
 | Florian Cajori - Mathematics - 1898 - 512 pages
...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... | |
 | Arthur A. Dodd, B. Thomas Chace - Geometry - 1898 - 490 pages
...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... | |
 | Yale University - 1898 - 212 pages
...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.... | |
 | James Howard Gore - Geometry - 1898 - 232 pages
...a triangle is greater than the difference of the other two sides. PROPOSITION XII. THEOREM. 79. The sum of the three angles of a triangle is equal to two right angles. Let ABC be any triangle. To prove that Z A + Z B + Z BC A is equal to two right angles. From... | |
 | George Albert Wentworth - Geometry, Plane - 1899 - 278 pages
...sides opposite the equal angles are called homologous sides. PROPOSITION XVIII. THEOREM. 129. Tfie sum of the three angles of a triangle is equal to two right angles. Let A, B, and BCA be the angles of the triangle ABC. To prove that ZA + ZB + Z BCA = 2 rt.... | |
 | George Albert Wentworth - Geometry - 1899 - 496 pages
...sides opposite the equal angles are called homologous sides. PROPOSITION XVIII. THEOREM. 129. Tlie sum of the three angles of a triangle is equal to two right angles. BE A c ~F Let A, B, and BCA be the angles of the triangle ABC. To prove that ZA + ZB + Z BCA... | |
| |
After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles... 
