 | University of St. Andrews - 1904 - 790 pages
...on opposite sides of it. The line joining CD meets AB in E. Prove that CE is equal to DE. 14. If a side of a triangle be produced, the exterior angle is equal to the sum of the two interior and opposite angles ; and the three interior angles of every triangle are together equal to two right angles.... | |
 | 130 pages
...prove that EX= EY. 3. Show that the line XEY (in No. 2) bisects the parallelogram. 38. PROP. 7. If one side of a triangle be produced, the exterior angle is equal to the sum of the two interior opposite angles, and the three angles of every triangle are together equal to two right angles. Let... | |
 | 1891 - 856 pages
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 | Canada - 1888 - 880 pages
...sides also which subtend, or are opposite to, the equal angles, shall be equal to one another. 3. If a side of a triangle be produced, the exterior angle is equal to the two interior and opposite angles; and the three interior angles of every triangle are together equal... | |
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If any side of a triangle be produced, the exterior angle is equal to the sum of the two interior and opposite angles. 
