This is the railing beside the stairs on the outside of my grandparents’ house that has many vertical poles, one diagonal pole, and horizontal poles holding everything together. The vertical pole acts as the transversal to the diagonal and horizontal poles. And because these two poles are not parallel, the alternate interior angles are not congruent. Many houses have a railing leading up to their front door, so the horizontal and vertical poles (that are perpendicular) provide support for it to stand up straight. But, the diagonal pole, in the picture below, acts as a hand rail and extra support for the railing itself. Almost any building or house in the world that has stairs, uses a railing for support and safety reasons. It is especially helpful that the diagonal pole and the horizontal pole do not provide alternate interior angles because people need a stronger support system to grab when walking up stairs or an incline. And non-parallel lines give a structure something diferent and sometimes stronger to work with.
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