This is a picture of a ladder. The two green lines are cut by the blue transversal. Since the two green lines are not parallel, the alternate interior angles are not congruent. Example of this are the yellow arched angle and the red arched angle. The red arched angle is obtuse and the yellow one is acute. Ladders can be found in most homes. Ladders are also used at construction sights and whenever anyone needs to reach something above their height.
This image was found at: http://img.rakuten.com
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