99 ! match the vocabulary word with the correction definition. 1. exterior angle of a triangle (model 1) 2. remote interior angles (model 2) 3. auxiliary line (model 3) 4. corollary (model 4) an angle formed by one side of a triangle and the extension of an adjacent side of the triangle. with respect to an exterior angle, the two interior angles of the triangle that are not adjacent to the exterior angle. a statement that is easily proved by applying a theorem. a line introduced in a figure to make a proof possible.