 | John Charles Stone - Mathematics - 1919 - 232 pages
...formed by 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.)... | |
 | John Charles Stone - Mathematics - 1919 - 248 pages
...all three angles of the triangle ? By trying this experiment with any triangle, you will find that, D The sum of the three angles of any triangle is equal to 180 degrees. 12. How many degrees in each angle of an equilateral tiiangle ? (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... | |
 | Clarence E. Paddock, Edward Ellsworth Holton - Arithmetic - 1920 - 250 pages
...obtuse angle, as the triangle MNP. (Fig. 31.) FIG. 30.—Acute Triangle. F 7 G. 31.—Obtuse Triangle. The sum of the three angles of any triangle is equal to 180 degrees or two right angles. The sum of the two acute angles of a right triangle is equal to 90... | |
 | 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... | |
 | Gilbert Murray, William Ralph Inge, John Burnet - Greece - 1921 - 508 pages
...quadratic equation xz=ab. The Pythagoreans knew the properties of parallels and proved the theorem that the sum of the three angles of any triangle is equal to two right angles. As we have seen, the Pythagorean theory of proportion, being numerical, was inadequate in that it did... | |
 | College Entrance Examination Board - Universities and colleges - 1922 - 124 pages
...credits will not be given on this paper for plane geometry and solid geometry. Take ir=3} 1. Prove: The sum of the three angles of any triangle is equal to two right angles. 2. Prove: If two triangles have their sides respectively proportional, the triangles are similar. 3.... | |
 | Charles William Weick - Geometrical drawing - 1925 - 276 pages
...between 90° and 180°. TRIANGLES 320. A triangle is any plane figure bounded by three straight 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... | |
 | John Charles Stone - Mathematics - 1926 - 344 pages
...formed by 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.)... | |
 | Education - 1893 - 650 pages
...hypothesis. 2. Write two postulates and two axioms. 3. Define chord, segment, sector, polygon. 4. Demonstrate that the sum of the three angles of any triangle is equal to two right angles. 5. Demonstrate that any angle formed by a tangent and a chord is measured by one-half the intercepted... | |
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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. 
