 | Arthur Schultze - Algebra - 1905 - 674 pages
...area would be increased (a) 17, (b~) 917, (c) 415,673 square feet. Find the side of the square. 51. The sum of the three angles of any triangle is equal to 180°. The second angle equals three times the first, and the third angle 5 times the first: Find the... | |
 | Arthur Schultze - 1905 - 396 pages
...area would be increased (a) 17, (6) 917, (c) 415,673 square feet. Find the side of the square. 51. The sum of the three angles of any triangle is equal to 180°. In a given triangle the second angle equals three times the first, and the third angle 5 times... | |
 | Arthur Schultze - Algebra - 1906 - 584 pages
...area would be increased (a) 17, (b) 917, (c) 415,673 square feet. Find the side of the square. 51. The sum of the three angles of any triangle is equal to 180°. In a given triangle the second angle equals three times the first, and the third angle 5 times... | |
 | Joseph Victor Collins - Algebra - 1908 - 442 pages
...APPLICATIONS IN GEOMETRY 154. Some Theorems of Geometry stated algebraically with Exercises. 1. THEOKEM. The sum, of the three angles of any triangle is equal to two right angles, or ISO0. Construct on sheets of paper several triangles like ABC in the margin. Cut the angles off... | |
 | Walter Percy Workman - Geometry - 1908 - 228 pages
...4.) FIG. 487. EXERCISES CX.XVII. EXAMPLES ON INVERSION. 1. Invert the following theorems : — (a) The sum of the three angles of any triangle is equal to two right angles. (b) AB and CD are two parallel lines. A line which is drawn at right angles to AB, is also at right... | |
 | Joseph Victor Collins - Algebra - 1910 - 332 pages
...APPLICATIONS Ш GEOMETRY 154. Some Theorems of Geometry stated algebraically with Exercises. 1. THEOKEM. The sum of the three angles of any triangle is equal to two right angles, or ISO0. Construct on sheets of paper several triangles like ABC in the margin. Cut the angles off... | |
 | George William Myers - Mathematics - 1910 - 304 pages
...two angles are parallel, right to right and left to left (Fig. .40), the angles are equal. Prove. 3. The sum of the three angles of any triangle is equal to a straight angle, or to two right angles. Prove. (See Fig. 42. See also FYM, pp. 54, 55.) 62. A triangle... | |
 | Geometry, Plane - 1911 - 192 pages
...that BF = -=-. nn + l JUNE, 1906 (One hour and a half.) The University provides a Syllabus. 1. Prove that the sum of the three angles of any triangle is equal to two right angles. On a line AE choose a point B, and construct an isosceles triangle ABC with AB as base, the base angles... | |
 | Walter Burton Ford, Charles Ammerman - Geometry, Plane - 1913 - 378 pages
...(The quadrilateral formed is called a parallelogram.) PART III. ANGLES AND TRIANGLES 62. Theorem XI. The sum of the three angles of any triangle is equal to two right angles, or 18(f. Given any triangle ABC. To prove that Z A + Z B + Z C= 2 rt. A. Proof. Prolong AB to D and... | |
 | Walter Burton Ford, Earle Raymond Hedrick - Geometry, Modern - 1913 - 272 pages
...(The quadrilateral formed is called a parallelogram.) PART III. ANGLES AND TRIANGLES 62. Theorem XI. The sum of the three angles of any triangle is equal to two right angles, or 180". Given any triangle ABC. To prove that Z 4 + ZB + Z (7= 2 rt. A. Proof. Prolong AB to D and... | |
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The sum of the three angles of any triangle is equal to two right angles, this is a Theorem, the truth of which is demonstrated by Geometry. 
