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.
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Vertical lines are lines that go straight up and down, with no horizontal component. Some real examples of vertical lines include the edges of a door frame, the corner of a bookshelf, and the sides of a skyscraper. These lines have a slope that is undefined, as they have no horizontal change.
The lines on a highway
Some examples for parallel lines- railroad tracks, steps, buildings, paper, windows, ect. Some examples for perpendicular lines- stop sign, bridge, street intersection, driveway into a street, ect.
Scales or balances.
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