Q: A line is this when it is at 90 degrees to a horizontal base?

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'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 line that is not at an angle of 90 degrees to the horizontal!

A vertical line at 90 degrees

A line 90 degrees from horizontal is a plumb line.

Construct a perpendicular line that intersects a horizontal line at 90 degrees and then bisect the vertical line with the horizontal line will give an obtuse angle of 135 degrees because 90 degrees+45 degrees = 135 degrees

A right angle which is 90 degrees

Right angles (90 degrees) will be formed.

A vertical angle is perpendicular to a horizontal base and equals 90 degrees

It goes up like this ----> l

It is the horizontal number line that intersects the y axis at 90 degrees on the Cartesian plane

It's the horizontal line on the Cartesian plane that meets the y-axis at the origin at 90 degrees.

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.