A right angle which is 90 degrees
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A horizontal line is a line perpendicular to the vertical.
A vertical line at 90 degrees
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.
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