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" If the 90° and 60° angles are found to be correct, the third angle must be 30°, since the sum of the angles of any triangle is equal to 180°. "
Elements of Mechanical Drawing: The Use of Instruments; Theory of Projection ... - Page 6
by Gardner Chace Anthony - 1904 - 152 pages
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An Introduction to the Graphic Language: The Vocabulary, Grammatical ...

Gardner Chace Anthony - Mechanical drawing - 1922 - 194 pages
...in Art. 94, page 128. Test the angle by sliding the short edge on the T square until the hypothenuse coincides with or intersects the line measuring the...sum of the angles of any triangle is equal to 180°. 85. Compasses and Their Use. — Fig. 144 illustrates two of the best types of instruments used for...
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The Alexander-Sarratt Arithmetics, Volume 3

Thomas Alexander, Charles Madison Sarratt - Arithmetic - 1924 - 462 pages
...triangles and with the protractor measure each angle and find the sum of the three angles of each triangle. The sum of the angles of any triangle is equal to 180 degrees or 2 right angles. 329 8. Estimate each of the following angles and then measure : 9. Make...
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Principles and Applications of Mathematics for Communications-electronics

Electrical engineering - 1992 - 270 pages
...right angle of any right triangle is the hypotenuse (B, fig. 30). 1 32. Law of Angles of Any Triangle The sum of the angles of any triangle is equal to 180°. When given any two of three angles of a triangle, the third angle can be found by subtracting the sum...
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