 | Textbooks - 2002 - 366 pages
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 | Sally H. Spetz, Staff of Research Education Association - Education - 2002 - 238 pages
...sum of the measures of the three interior angles of a triangle is equal to 180°, and the measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles of the triangle. We can now start by considering... | |
 | ʻAbd al-ʻAlī ibn Muḥammad ibn Ḥusayn Birǧandī - Social Science - 2002 - 304 pages
...Add. Let us mention the principle concerning this. However, it is established on the condition that an exterior angle of a triangle is equal to (the sum of) the two interior (angles) opposite (to it). This is not correct in the case of a triangle resulting... | |
 | Education - 2003 - 232 pages
...triangle) so x = b + c The exterior angle of a triangle is made by extending one of the sides. The exterior angle of a triangle is equal to the sum of the two opposite interior angles of the triangle. Example Calculate the size of the lettered angles. Give reasons for your answers.... | |
 | Susan Ball, Sue Briggs, Margaret Mackenzie - 2003 - 212 pages
...facts that have already been proved, copy and complete the following proofs. a. B is shaded red The exterior angle of a triangle is equal to the sum of the two opposite interior angles. b. Ld = ^a + ^b (exterior angle is equal to the sum of the two opposite interior angles) td+ ^c= 180°... | |
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An exterior angle of a triangle is equal to the sum of the two opposite interior angles. 
