This is a slide, found in most, or all playgrounds used by children around the world for fun. The ground and the slide as lines are cut by the red line or the ladder as a transversal. This forms two alternate interior angles cut by a transversal and because the lines aren't parallel to each other the alternate interior angles aren't congruent. This is a huge attraction for kids around the world, and even for adults when the slides are bigger and higher. This picture is from a website :
http://www.mycutegraphics.com/graphics/kids/kids-playing-on-slide.html
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