0 degrees.
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Slope of a straight line is the same at all points on the line, whereas for a curved line it changes.
The gradient of the straight line
gradient
An undefined slope is just a line straight down. The slope is undefined.
A line with zero slope is a straight horizontal line which neigher climbs nor descends along the X-Axis. A line with an undefined slope is a straight vertical line that does not move left or right along the Y- Axis.