Non-congruent Alternate Interior Angles

Non-congruent alternate interior angles are shown in the picture above. Alternate interior angles are created when a transversal crosses two parallel lines. Each pair of these angles are inside the parallel lines, and on opposite sides of the transversal. Angles one and two marked in this picture are considered non-congruent alternate interior angles because the two lines that the transversal crosses are not parallel. The two lines that the transversal crosses are both green. The transversal is black. Windows allow the passage of light and, if not closed, air and sound. Windows are held by frames and houses from inclement weather. Most homes have windows.