It means a central angle measured in radians.
ex. Convert 360 degrees radians.
180 degrees = pi radians
so 360 degrees = pi radians/180 degrees = 360pi radians/180 = 2 pi radians
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The slope of a horizontal line is zero.
Since the line is horizontal, the slope is zero.
The slope of a horizontal line is zero. That's because the slope measures how steep the line is, and a flat line is not steep at all and therefore has no slope.
The line rotates anti-clockwise, from a horizontal to a vertical position.
A slope is 0 if it is a straight horizontal line. A slope is undefined if it is a straight vertical line.