what is an exterior angle of a triangle
An exterior angle of a triangle is an angle formed by one side of the triangle and the extension of an adjacent side of the triangle. FACTS: â¢ Every triangle has 6 exterior angles, two at each vertex. â¢ Angles 1 through 6 are exterior angles. â¢ Notice that the outside angles that are vertical to the angles inside the triangle are NOT called exterior angles of a triangle. The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles. (Non-adjacent interior angles may also be referred to as remote interior angles.). FACTS: â¢ An exterior â  is equal to the addition of the two Î´ angles not right next to it.