The inclination of a line is the angle θ which the part of the line (above the xaxis) makes with xaxis.
If measured in anticlockwise direction then the inclination θ is positive and if measured in clockwise direction then the inclination θ is negative.
The inclination of a line or the angle of inclination of the line is the angle which a straight line makes with the positive direction of xaxis measured in the anticlockwise direction to the part of the line above the xaxis. The inclination is usually denoted by θ.
Notes:
(i) The inclination of xaxis and every line parallel to xaxis is 0°
i.e. the inclination of a line parallel to xaxis or the xaxis itself is 0°.
(i) The inclination of yaxis and every line parallel to yaxis is 90°
i.e. the inclination of a line parallel to yaxis or the yaxis itself is 90°.
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