No, the horizon is horizontal. A vertical line is perpendicular to the horizon.
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A horizontal line is a line that is parallel to the horizon.
The horizon runs horizontal. Perpendicular to that is VERTICAL.
Infinite.
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.
An isosceles trapezoid has 1 vertical line of symmetry