If you are sitting in a room, the ceiling and the floor are parallel to each other. The walls are perpendicular to the floor and to the ceiling. So any line on these surfaces will be parallel to or perpendicular to any line on the other surface. And if they were not, the building could be quite unstable.
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Examples of horizontal lines in the real world include the horizon where the sky meets the land or sea, the straight line of a calm lake's surface, the boundary between the wall and floor in a room, and the straight line of a ruler placed flat on a table. Horizontal lines are parallel to the horizon and perpendicular to vertical lines.
Hexagons come in many different shapes and sizes. As long as the figure has 6 straight edges and 6 angles, (with closed figure, of course) it's a hexagon. A regular hexagon though, has no perpendicular sides.A regular 6 sided hexagon has no perpendicular lines but it does have 3 pairs of parallel lines.
Oh honey, you're in for a treat! The letters "O" and "S" have no parallel, perpendicular, or intersecting line segments. They're just doing their own thing, floating around without a care in the world. Just like me at a buffet table!
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Oh, dude, adjacent lines are like the neighbors of geometry. They just chill next to each other, but they don't necessarily run parallel. So, nah, adjacent lines don't have to be parallel. It's like saying just because you live next to someone, you must be best friends.