Q: What line is perpendicular to a horizontal line?

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A horizontal line is a line perpendicular to the vertical.

The line x = -4 is vertical, so a line that is perpendicular to it is horizontal, so its slope is 0.

Yes, but only if they are exactly vertical and exactly horizontal (90 degrees angular difference). For real-world examples, many vertical lines can be perpendicular to a single "horizontal" curved line at the points of intersection.

A right angle which is 90 degrees

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Related questions

A horizontal line is a line perpendicular to the vertical.

A horizontal line is perpendicular to a vertical line.

'altitude' or perpendicular. If on line is the base (horizontal) line, then the line that is a 90 degrees to it is the perpendicular/altitude.

It is a vertical line touching a horizontal line

A perpendicular line is one that is at right angle to another - usually to a horizontal line. A perpendicular bisector is a line which is perpendicular to the line segment joining two identified points and which divides that segment in two.

The symbol for perpendicular is a straight vertical line resting on a horizontal line just like a 'T' which is upside down.∟ or ┴

The horizon runs horizontal. Perpendicular to that is VERTICAL.

The line x = -4 is vertical, so a line that is perpendicular to it is horizontal, so its slope is 0.

No, the horizon is horizontal. A vertical line is perpendicular to the horizon.

Yes, but only if they are exactly vertical and exactly horizontal (90 degrees angular difference). For real-world examples, many vertical lines can be perpendicular to a single "horizontal" curved line at the points of intersection.

Perpendicular to a line passing through the center of the Earth.

A right angle which is 90 degrees