Vertical lines in space run perpendicular to the horizon. The very definition of perpendicular requires that the lines be at right angles to the horizon, so all lines that meet that definition are perpendicular.
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The horizon runs horizontal. Perpendicular to that is VERTICAL.
No, the horizon is horizontal. A vertical line is perpendicular to the horizon.
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.
Perpendicular
A line is perpendicular to a plane when it is perpendicular on two lines from the plane