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
The horizon runs horizontal. Perpendicular to that is VERTICAL.
No, the horizon is horizontal. A vertical line is perpendicular to the horizon.
vertical
y=0, x=R
33 degrees perpendicular to the horizon
It is a vertical line.
A circle through the Earth's sphere perpendicular to the observer's latitude
Vertical is defined as the direction or position that is perpendicular to the plane. Horizontal is defined as to be parallel to the horizon.
Draw a line perpendicular to the horizon axis, that goes from the top vertex, to a line that is the continuation of the base.
Vertical lines are lines that are drawn / made perpendicular to the horizon. In other words, they go "ceiling to floor", not "wall to wall" or "corner to corner."
There is no such thing as exactly vertical because either it is vertical or it is not. You cannot have approximately vertical - it is not vertical, then. Vertical means at 90 degrees to the horizon (or horizontal).
Receding lines converge into vanishing points. If you stared at railroad tracks leading away from you, as they approached the horizon, they'd appear to meet. They disappear/converge into the vanishing point.