 Thus when it is said that 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.  Elements of Mechanical Drawing - Page 22by Gardner Chace Anthony - 1894 - 98 pagesFull view - About this book
 | Walter Burton Ford, Charles Ammerman - Geometry, Solid - 1913 - 184 pages
...given line and passing through a given point. PART III. ANGLES AND TRIANGLES 62. Theorem XI. The sum of three angles of any triangle is equal to two right angles, or 180°. 63. Corollary 1. The sum of the two acute angles of any right triangle is one right angle, or 90°.... | |
 | Walter Burton Ford, Charles Ammerman - Geometry, Solid - 1913 - 176 pages
...given line and passing through a given point. PART III. ANGLES AND TRIANGLES 62. Theorem XI. The sum of three angles of any triangle is equal to two right -angles, or 750°. 63. Corollary 1. The sum of the two acute angles of any right triangle is one right angle, or... | |
 | Geometrical drawing - 1915 - 278 pages
...180. TRIANGLES 8 ㏄. AtHangIei8 ぬ nypl れ ne 丘 gurebound０dby t hreest 丁め igh 古 lines. The sum of the three angles of any triangle is equal to 180. If one of the angles is 90, or a right angle, the sum of the other two is 90. In radian measure,... | |
 | John Charles Stone, James Franklin Millis - Geometry - 1916 - 298 pages
...are called the angles, or, for distinction, the interior angles, of the triangle. 48. Theorem. — The sum of the three angles of any triangle is equal to a straight angle. Hypothesis. ZA, Z. B, and ZC are the angles of A ABC. Conclusion. ZA + ZB + Z (7=... | |
 | Frank Eugene Austin - Electric currents, Alternating - 1916 - 260 pages
...196-100-144 -48 cos C = — - - - . „ - - = — — = +0.2 From tables, angle C = 78° 28' . . Since the sum of the three angles of any triangle is equal to 2 right angles or 180 degrees (or IT radians), the above result may be checked by adding the values... | |
 | Samuel Hamilton - Arithmetic - 1917 - 406 pages
...equal to 180°. This can also be shown by measuring the angles with a protractor. The gum of all the angles of any triangle is equal to two right angles, or 180°. Written Work The following numbers in each case represent the size of two angles of a triangle. Find... | |
 | James Champlin Fernald - English language - 1918 - 488 pages
...all that grammar requires. It is perfectly grammatical to say, "Light is the same as darkness," or, "The sum of the three angles of any triangle is equal to three rightangles." However false these statements may be, the words are properly connected, which... | |
 | John Charles Stone - Mathematics - 1919 - 232 pages
...all three angles of the triangle ? By trying this experiment with any triangle, you will find that, The sum of the three angles of any triangle is equal to 180 degrees. 12. How many degrees in each angle of an equilateral triangle ? (The angles are all equal.)... | |
 | Matilda Auerbach, Charles Burton Walsh - Geometry, Plane - 1920 - 408 pages
...perimeter to be 110 feet. 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... | |
 | Arvid Reuterdahl - Minnesota - 1920 - 310 pages
...1. Only one straight line can be drawn through a given point parallel to a given straight line. 2. The sum of the three angles of any triangle is equal to 180°. 3. Space regarded as infinite. The perspective view of infinitely distant parts of a plane is... | |
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