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Bøker Bok 7180 av 189After 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
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New Franklin Arithmetic: 1st[-2d] Book, Volum 2

Edwin Pliny Seaver, George Augustus Walton - 1895
...it out. Tear off C FIG. 24. two of the angles and place them, as in Fig. 24, so as to show that The sum of the three angles of a triangle is equal to two right angles. e. How many degrees are there in each angle of an equilateral triangle ? /. If the two acute...
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Numerical Problems in Plane Geometry: With Metric and Logarithmic Tables

Joe Garner Estill - 1896 - 161 sider
...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...
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Syllabus of Geometry

George Albert Wentworth - 1896 - 50 sider
...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...
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Numerical Problems in Plane Geometry with Metric and Logarithmic Tables

Joe Garner Estill - 1896 - 144 sider
...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...
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Geometry for Grammar Schools

Ephraim Hunt - 1896
...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...
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Helps in the Use of Good English: A Hand-book for All who Desire to ..., Bok 1

Albert Newton Raub - 1897 - 260 sider
...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....
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Plane and Solid Geometry

James Howard Gore - 1898 - 210 sider
...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...
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Entrance Examinations in Mathematics, 1884 to 1898 [with Supplements to 1900]

Yale University - 1898
...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....
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A History of Elementary Mathematics

Florian Cajori - 1898 - 422 sider
...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...
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Plane and Solid Geometry: Inductive Method

Arthur A. Dodd, B. Thomas Chace - 1898 - 406 sider
...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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