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" This is so because the sum of the three angles of a triangle is always equal to two right angles, as the pupil will learn in more advanced geometry. "
Elementary Course in Mechanical Drawing for Manual Training and Technical ... - Σελίδα 84
των Arthur Wesley Chase - 1904 - 189 σελίδες
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Elements of Geometry: With Practical Applications, for the Use of Schools

Timothy Walker - 1829 - 156 σελίδες
...triangle will then be inscribed. Thus every triangle can be inscribed in a circle. 46. THEOREM. — The sum of the three angles of a triangle is always equal to two right angles. DEM. — The F 30 triangle ABC (fig. 30) being inscribed, each of its angles is measured by half the...

The Watchmakers' Hand-book

Claudius Saunier - 1881 - 590 σελίδες
...circumstances the three angles are also equal ; and isosceles when only two sides are of equal length. The sum of the three angles of a triangle is always equal to two right angles. If only two of the angles are known, it is thus easy to determine the third. Similar triangles are...

The Art of Debate

Raymond Macdonald Alden - 1900 - 308 σελίδες
...theorem. But it is clear that an intelligent debate cannot be held on the question, "Resolved, That the sum of the three angles of a triangle is always equal to two right angles." Neither can one debate successfully the statement that temperance is a useful virtue, or that the cruelties...

The Foundations of Euclidian Geometry as Viewed from the Standpoint of ...

Israel Euclid Rabinovitch - 1903 - 140 σελίδες
...zero at each point ; or, otherwise, the metric relations of space are completely determined, if the sum of the three angles of a triangle is always equal to two right angles. 2°. Besides the independence of line-length from position, we may assume with Euclid the existence...

Elementary Course in Mechanical Drawing for Manual Training and ..., Μέρος 1

Arthur Wesley Chase - 1904 - 200 σελίδες
...included angle are given. Construction: — Assume two lines, the shorter to be not less than 1% in. long, placing them towards the upper left corner of the...any length, but for this drawing let it be between 234 in. and 3 in. long. 84 85 line. From either extremity (use the right), lay off a distance equal...

Oral Arithmetic

George Wentworth, David Eugene Smith - 1910 - 232 σελίδες
...there in the angle made by the two hands of a clock ? How many at 4 o'clock ? at 2 o'clock ? 10. The sum of the three angles of a triangle is always equal to two right angles. In an equilateral triangle the angles are all equal. How many degrees in each ? 11. If there are 200...

The Public Speaking Review, Τόμοι 3-4

1913 - 416 σελίδες
...It is plain that an intelligent debate cannot be held on the proposition, "Resolved, that the sum of three angles of a triangle is always equal to two right angles." Then further on he says that questions just as obvious as these are sometimes debated because their...

The Theory and Practice of Argumentation and Debate

Victor Alvin Ketcham - 1914 - 400 σελίδες
...geometry. It is plain that an intelligent debate cannot be held on the proposition, "Resolved, that the sum of the three angles of a triangle is always equal to two right angles." Equally useless from the standpoint of argumentation is it to dispute that "All men are mortal," that...

Successful Speaking: A Text for Secondary Schools

William Phillips Sandford, Willard Hayes Yeager - 1927 - 248 σελίδες
...approximately $11,000,000,000. The map of Europe was considerably changed after the world war. The sum of the three angles of a triangle is always equal to two right angles. These are but a few examples. You will, no doubt, be able to think of many others. Each of these statements...

Index to Mathematical Problems, 1980-1984

Stanley Rabinowitz - 1992 - 554 σελίδες
...isosceles. Solid geometry: tetrahelix Problems sorted by topic Squares JRM 912. by Antonio Filz The sum of the three angles of a triangle is always equal to ir. But is the sum of the solid angles at the four vertices of a tetrahedron a constant? If so, what...
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