An angle is basically a measure of how far off from 180 degrees something is.
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Gradient
It is the slope or gradient of the line that measures its steepness.
The measure of the steepness of line expressed as rise over run is called slope.
A straight horizontal line is a line having no steepness.
the steepness of the line is the slope of the line which is the rate of change; the steeper the slope, the faster the rate of change