Pictured here is the chain of a chandelier which is perpendicular to the ceiling. The chain of the chandelier isn't a true line because there are no lines that go on forever in real life. Yet it is a segment that goes until it hits the roof where it makes a right angle which means it is perpendicular. The flat surface of the roof represents the plane that the segment is perpendicular to. I took this photo upstairs at my house and chandeliers can be found in many houses. It is an object used because of its design and beauty but also for its effect which is illuminating areas. Many American families may have a chandelier but they can be found in homes across the world.
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