60 triangle notes with Keeler Posted on December 14, 2011 by Alice Keeler Triangle sum theorem: the angles add up to 180° Exterior angle is supplementary to the interior angle. 180°-115°=65° can have ONE 90° angle OR ONE obtuse angle. 180°/3 = 60° equiangular

60 triangle notes Posted on December 13, 2011 by Alice Keeler Triangle sum postulate: the angles of a triangle add to 180°. Exterior angles are supplementary. 180°-115°=65° 43°+82°+x=180° triangle sum postulate Triangle: 180/3 = 60° equiangular Only ONE angle can be right OR obtuse.