 | United States Civil Service Commission - Civil service - 1424 pages
...Give the operation in full. (Second subject : Oeometry.) Question 1. What is geometry f Question 2. Prove that the sum of the angles of a triangle is equal to two right angles. Give demonstration in full. Question 3. Prove that in any triangle the greater side... | |
 | Vermont. Dept. of Education - 1880 - 216 pages
...one-third of the product of its base by its altitude." JUNE, 1880. [From Ohio School Report, 1879.1 1. Prove that the sum of the angles of a triangle is equal to two right angles. To what is each angle of ar; equilateral decagon equal ? 2. By what is the angle... | |
 | United States Civil Service Commission - Civil service - 1884 - 222 pages
...Give the operation in full. (Second subject : Geometry.) Question 1. What is geometry? Question 2. Prove that the sum of the angles of a triangle is equal to two right angles. Give demonstration in full. Question 3, Prove that in any triangle the greater side... | |
 | United States - 1885 - 296 pages
...Give the operation in full. (Second subject : Geometry.) Question 1. What is geometry t Question 2. Prove that the sum of the angles of a triangle is equal to two right angles. Give demonstration in full. Question 3. Prove that in any triangle the greater side... | |
 | George Anthony Hill - Geometry - 1888 - 202 pages
...direct measurement. LESSONS IN GEOMETRY. Lesson 31. 1. How can it be shown to the eye that the sum of the angles of a triangle is equal to a straight angle, or 180°? Draw a triangle ABC (Fig. 64) and the altitude CD. Cut out the triangle, and fold the corners... | |
 | George Anthony Hill - Geometry - 1888 - 200 pages
...three other parts by direct measurement. V\ Lesson 31. 1. How can it be shown to the eye that the sum, of the angles of a triangle is equal to a straight angle, or 180°? Draw a triangle ABC (Fig. 64) and the altitude CD. Cut out the triangle, and fold the corners... | |
 | James Hervey Hyslop - Logic - 1899 - 280 pages
...proposition affirmed or denied. I give an illustration of its method from mathematics. Suppose I am asked to prove that the sum of the angles of a triangle is equal to two right angles. If now I can show either by observation or proof that the 202 sum of the angles of... | |
 | Arthur Schultze, Frank Louis Sevenoak - Geometry - 1901 - 394 pages
...of the first must be parallel to the third side of the second. PROPOSITION XII. THEOREM 93. The sum of the angles of a triangle is equal to a straight angle. B ------ c Hyp. ABC is a triangle. To prove ZA + ZB + ZC = a st. Z. Proof. Draw line DE || BC through... | |
 | Arthur Schultze, Frank Louis Sevenoak - Geometry - 1901 - 396 pages
...of the first must be parallel ti the third side of the second. PROPOSITION XII. THEOREM 93. Tfie sum of the angles of a triangle is equal to a straight angle. B Hyp. ABC is a triangle. To prove ZA + ZB + ZC= a st.Z. Proof. Draw line DE || BC through A. . (Ax.... | |
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The sum of the angles of a triangle is equal to a straight angle. 
