 | 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.... | |
 | 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... | |
 | Ed - 1905 - 272 pages
...invest so as to ensure a yearly income of ¿200 ? GEOMETRY. — PART I. (Time allowed, z\ hours) (1) Prove that the sum of the angles of a triangle is equal to two right angles. If the interior angle of a regular polygon is 140°, calculate the number of sides.... | |
 | Wilbur Fisk Nichols - 1905 - 208 pages
...always greater than the third side. NOTE. — To prove, use your definition of a straight line. 2. Prove that the sum of the angles of a triangle is equal to two right angles, or 180°. Z ACB + Z BCE + Z EOF = 2 rt. A. The sum of all the angles about a point... | |
 | Webster Wells - Geometry, Plane - 1908 - 206 pages
...must have ZC > Z P. Ex. 25. By drawing a line through the vertex of a triangle parallel to the base, prove that the sum of the angles of a triangle is equal to two right angles. Ex. 26. The line which joins the vertex of an isosceles triangle to the intersection... | |
 | Webster Wells - Geometry - 1908 - 329 pages
...must have ZC > Z F. Ex. 25. By drawing a line through the vertex of a triangle parallel to the base, prove that the sum of the angles of a triangle is equal to two right angles. Ex. 26. The line which joins the vertex of an isosceles triangle to the intersection... | |
 | Webster Wells - Geometry - 1908 - 336 pages
...must have ZC > Z F. Ex. 25. By drawing a line through the vertex of a triangle parallel to the base, prove that the sum of the angles of a triangle is equal to two right angles. Ex. 26. The line which joins the vertex of an isosceles triangle to the intersection... | |
 | Daniel Pomeroy Rhodes - Cosmology - 1909 - 434 pages
...have already been mentioned. A typical case, finally, is the following. It is undoubtedly useful to prove that the sum of the angles of a triangle is equal to two right angles, when you are living in a world which you can as yet understand only through its superficial... | |
 | University of Calcutta - 1911 - 760 pages
...(ax+by)*. 6. (1) Solve b_ _a _ x x—b+a 5 Or, 9x-Sy=n \ 5 13y-2a;=20 j ' (2) Draw the graph of 5 7. Prove that the sum of the angles of a triangle is equal to two 7 right angles. Prove that the six angles of any two equilateral triangles are 6 equal to one another.... | |
 | Newfoundland Council of Higher Education - 1912 - 300 pages
...the side AD, and the angle DBG is equal to the angle BDC. Show that AC bisects the angle BAD. (8) 5. Prove that the sum of the angles of a triangle is equal to two right angles. If the bisectors of the angles ADC, BCD of a quadrilateral ABCD meet at E, prove... | |
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The sum of the angles of a triangle is equal to a straight angle. 
